SAT Vocabulary Words 12

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Approximately 5000 vocabulary words that should be memorized before taking the SAT. This lesson is broken into 26 parts.

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hydraulic

hydraulic (adj)
Involving the moving of water, of the force exerted by water in motion.

hydrodynamics

hydrodynamics (n)
The branch of mechanics that treats of the dynamics of fluids.

hydroelectric

hydroelectric (adj)
Pertaining to electricity developed water or steam.

hydromechanics

hydromechanics (n)
The mechanics of fluids.

hydrometer

hydrometer (n)
An instrument for determining the density of solids and liquids by flotation.

hydrostatics

hydrostatics (n)
The branch of science that treats of the pressure and equilibrium of fluids.

hydrous

hydrous (adj)
Watery.

hygiene

hygiene (n)
The branch of medical science that relates to improving health.

hypercritical

hypercritical (adj)
Faultfinding.

hypnosis

hypnosis (n)
An artificial trance-sleep.

hypnotic

hypnotic (adj)
Tending to produce sleep.

hypnotism

hypnotism (n)
An artificially induced somnambulistic state in which the mind readily acts on suggestion.

hypnotize

hypnotize (v)
To produce a somnambulistic state in which the mind readily acts on suggestions.

hypocrisy

hypocrisy (n)
Extreme insincerity.

hypocrite

hypocrite (n)
One who makes false professions of his views or beliefs.

hypodermic

hypodermic (adj)
Pertaining to the area under the skin.

hypotenuse

hypotenuse (n)
The side of a right-angled triangle opposite the right angle.

hypothesis

hypothesis (n)
A proposition taken for granted as a premise from which to reach a conclusion.

hysteria

hysteria (n)
A nervous affection occurring typically in paroxysms of laughing and crying.

ichthyic

ichthyic (adj)
Fish-like.

ichthyology

ichthyology (n)
The branch of zoology that treats of fishes.

ichthyosaurs

ichthyosaurs (n)
A fossil reptile.

icily

icily (adv)
Frigidly.

iciness

iciness (n)
The state of being icy.

icon

icon (n)
An image or likeness.

iconoclast

iconoclast (n)
An image-breaker.

idealize

idealize (v)
To make to conform to some mental or imaginary standard.

idiom

idiom (n)
A use of words peculiar to a particular language.

idiosyncrasy

idiosyncrasy (n)
A mental quality or habit peculiar to an individual.

idolize

idolize (v)
To regard with inordinate love or admiration.

ignoble

ignoble (adj)
Low in character or purpose.

ignominious

ignominious (adj)
Shameful.

Iliad

Iliad (n)
A Greek epic poem describing scenes from the siege of Troy.

illegal

illegal (adj)
Not according to law.

illegible

illegible (adj)
Undecipherable.

illegitimate

illegitimate (adj)
Unlawfully begotten.

illiberal

illiberal (adj)
Stingy.

illicit

illicit (adj)
Unlawful.

illimitable

illimitable (adj)
Boundless.

illiterate

illiterate (adj)
Having little or no book-learning.

ill-natured

ill-natured (adj)
Surly.

illogical

illogical (adj)
Contrary to the rules of sound thought.

illuminant

illuminant (n)
That which may be used to produce light.

illuminate

illuminate (v)
To supply with light.

illumine

illumine (v)
To make bright or clear.

illusion

illusion (n)
An unreal image presented to the senses.

illusive

illusive (adj)
Deceptive.

illusory

illusory (adj)
Deceiving or tending to deceive, as by false appearance.

imaginable

imaginable (adj)
That can be imagined or conceived in the mind.

imaginary

imaginary (adj)
Fancied.

imbibe

imbibe (v)
To drink or take in.

imbroglio

imbroglio (n)
A misunderstanding attended by ill feeling, perplexity, or strife.

imbrue

imbrue (v)
To wet or moisten.

imitation

imitation (n)
That which is made as a likeness or copy.

imitator

imitator (n)
One who makes in imitation.

immaculate

immaculate (adj)
Without spot or blemish.

immaterial

immaterial (adj)
Of no essential consequence.

immature

immature (adj)
Not full-grown.

immeasurable

immeasurable (adj)
Indefinitely extensive.

immense

immense (adj)
Very great in degree, extent, size, or quantity.

immerse

immerse (v)
To plunge or dip entirely under water or other fluid.

immersion

immersion (n)
The act of plunging or dipping entirely under water or another fluid.

immigrant

immigrant (n)
A foreigner who enters a country to settle there.

immigrate

immigrate (v)
To come into a country or region from a former habitat.

imminence

imminence (n)
Impending evil or danger.

imminent

imminent (adj)
Dangerous and close at hand.

immiscible

immiscible (adj)
Separating, as oil and water.

immoral

immoral (adj)
Habitually engaged in licentious or lewd practices.

immortalize

immortalize (v)
To cause to last or to be known or remembered throughout a great or indefinite length of time.

immovable

immovable (adj)
Steadfast.

immune

immune (adj)
Exempt, as from disease.

immutable

immutable (adj)
Unchangeable.

impair

impair (v)
To cause to become less or worse.

impalpable

impalpable (adj)
Imperceptible to the touch.

impartial

impartial (adj)
Unbiased.

impassable

impassable (adj)
That can not be passed through or over.

impassible

impassible (adj)
Not moved or affected by feeling.

impassive

impassive (adj)
Unmoved by or not exhibiting feeling.

impatience

impatience (n)
Unwillingness to brook delays or wait the natural course of things.

impeccable

impeccable (adj)
Blameless.

impecunious

impecunious (adj)
Having no money.

impede

impede (v)
To be an obstacle or to place obstacles in the way of.

impel

impel (v)
To drive or urge forward.

impend

impend (v)
To be imminent.

imperative

imperative (adj)
Obligatory.

imperceptible

imperceptible (adj)
Indiscernible.

imperfectible

imperfectible (adj)
That can not be perfected.

imperil

imperil (v)
To endanger.

imperious

imperious (adj)
Insisting on obedience.

impermissible

impermissible (adj)
Not permissible.

impersonal

impersonal (adj)
Not relating to a particular person or thing.

impersonate

impersonate (v)
To appear or act in the character of.

impersuadable

impersuadable (adj)
Unyielding.

impertinence

impertinence (n)
Rudeness.

imperturbable

imperturbable (adj)
Calm.

impervious

impervious (adj)
Impenetrable.

impetuosity

impetuosity (n)
Rashness.

impetuous

impetuous (adj)
Impulsive.

impetus

impetus (n)
Any impulse or incentive.

impiety

impiety (n)
Irreverence toward God.

impious

impious (adj)
Characterized by irreverence or irreligion.

implausible

implausible (adj)
Not plausible.

impliable

impliable (adj)
Capable of being inferred.

implicate

implicate (v)
To show or prove to be involved in or concerned

implicit

implicit (adj)
Implied.

imply

imply (v)
To signify.

impolitic

impolitic (adj)
Inexpedient.

importation

importation (n)
The act or practice of bringing from one country into another.

importunate

importunate (adj)
Urgent in character, request, or demand.

importune

importune (v)
To harass with persistent demands or entreaties.

impotent

impotent (adj)
Destitute of or lacking in power, physical, moral, or intellectual.

impoverish

impoverish (v)
To make indigent or poor.

impracticable

impracticable (adj)
Not feasible.

impregnable

impregnable (adj)
That can not be taken by assault.

impregnate

impregnate (v)
To make pregnant.

impromptu

impromptu (n)
Anything done or said on the impulse of the moment.

improper

improper (adj)
Not appropriate, suitable, or becoming.

impropriety

impropriety (n)
The state or quality of being unfit, unseemly, or inappropriate.

improvident

improvident (adj)
Lacking foresight or thrift.

improvise

improvise (v)
To do anything extemporaneously or offhand.

imprudent

imprudent (adj)
Heedless.

impudence

impudence (n)
Insolent disrespect.

impugn

impugn (v)
To assail with arguments, insinuations, or accusations.

impulsion

impulsion (n)
Impetus.

impulsive

impulsive (adj)
Unpremeditated.

impunity

impunity (n)
Freedom from punishment.

impure

impure (adj)
Tainted.

impute

impute (v)
To attribute.

inaccessible

inaccessible (adj)
Difficult of approach.

inaccurate

inaccurate (adj)
Not exactly according to the facts.

inactive

inactive (adj)
Inert.

inadequate

inadequate (adj)
Insufficient.

inadmissible

inadmissible (adj)
Not to be approved, considered, or allowed, as testimony.

inadvertent

inadvertent (adj)
Accidental.

inadvisable

inadvisable (adj)
Unadvisable.

inane

inane (adj)
Silly.

inanimate

inanimate (adj)
Destitute of animal life.

inapprehensible

inapprehensible (adj)
Not to be understood.

inapt

inapt (adj)
Awkward or slow.

inarticulate

inarticulate (adj)
Speechless.

inaudible

inaudible (adj)
That can not be heard.

inborn

inborn (adj)
Implanted by nature.

inbred

inbred (adj)
Innate.

incandescence

incandescence (n)
The state of being white or glowing with heat.

incandescent

incandescent (adj)
White or glowing with heat.

incapacitate

incapacitate (v)
To deprive of power, capacity, competency, or qualification.

incapacity

incapacity (n)
Want of power to apprehend, understand, and manage.

incarcerate

incarcerate (v)
To imprison.

incendiary

incendiary (n)
Chemical or person who starts a fire-literally or figuratively.

incentive

incentive (n)
That which moves the mind or inflames the passions.

inception

inception (n)
The beginning.

inceptive

inceptive (adj)
Beginning.

incessant

incessant (adj)
Unceasing.

inchmeal

inchmeal (adv)
Piecemeal.

inchoate

inchoate (adj)
Incipient.

inchoative

inchoative (n)
That which begins, or expresses beginning.

incidence

incidence (n)
Casual occurrence.

incident

incident (n)
A happening in general, especially one of little importance.

incidentally

incidentally (adv)
Without intention.

incinerate

incinerate (v)
To reduce to ashes.

incipience

incipience (n)
Beginning.

incipient

incipient (adj)
Initial.

incisor

incisor (n)
A front or cutting tooth.

incite

incite (v)
To rouse to a particular action.

incitement

incitement (n)
That which moves to action, or serves as an incentive or stimulus.

incoercible

incoercible (adj)
Incapable of being forced, constrained, or compelled.

incoherence

incoherence (n)
Want of connection, or agreement, as of parts or ideas in thought, speech, etc.

incoherent

incoherent (adj)
Not logically coordinated, as to parts, elements, or details.

incombustible

incombustible (adj)
That can not be burned.

incomparable

incomparable (adj)
Matchless.

incompatible

incompatible (adj)
Discordant.

incompetence

incompetence (n)
General lack of capacity or fitness.

incompetent

incompetent (adj)
Not having the abilities desired or necessary for any purpose.

incomplete

incomplete (adj)
Lacking some element, part, or adjunct necessary or required.

incomprehensible

incomprehensible (adj)
Not understandable.

incompressible

incompressible (adj)
Resisting all attempts to reduce volume by pressure.

inconceivable

inconceivable (adj)
Incomprehensible.

incongruous

incongruous (adj)
Unsuitable for the time, place, or occasion.

inconsequential

inconsequential (adj)
Valueless.

inconsiderable

inconsiderable (adj)
Small in quantity or importance.

inconsistent

inconsistent (adj)
Contradictory.

inconstant

inconstant (adj)
Changeable.

incontrovertible

incontrovertible (adj)
Indisputable.

inconvenient

inconvenient (adj)
Interfering with comfort or progress.

indefensible

indefensible (adj)
Untenable.

indefinitely

indefinitely (adv)
In a vague or uncertain way.

indelible

indelible (adj)
That can not be blotted out, effaced, destroyed, or removed.

indescribable

indescribable (adj)
That can not be described.

indestructible

indestructible (adj)
That can not be destroyed.

indicant

indicant (adj)
That which points out.

indicator

indicator (n)
One who or that which points out.

indict

indict (v)
To find and declare chargeable with crime.

indigence

indigence (n)
Poverty.

indigenous

indigenous (adj)
Native.

indigent

indigent (adj)
Poor.

indigestible

indigestible (adj)
Not digestible, or difficult to digest.