incorporeal.adjective
lacking material form or substance; compare corporeal
incorporeality.noun
incorporeally.adverb

infuse, infused, infusing, infuses.transitive verbs
to put in or introduce as if by pouring (infused new vigor into the movement); impart; instill; to fill or cause to be filled with something (infused them with a love of the land); pervade; imbue
infuser.noun

ingest, ingested, ingesting, ingests.transitive verbs
to put into the body for digestion
ingestion.noun
ingestive.adjective

inoculate.transitive verb
to inject a serum, vaccine, etc. into

insignificant.adjective
meaningless; unimportant; trivial; small

interfere.intransitive verb
to come in or between for some purpose; intervene; to meddle; interpose
interference.noun

invalid.adjective
not legally or factually valid; having no force; falsely based or reasoned; faulty (an invalid constitution); null or void to disable or weaken (an invalid license); 
invalidate.transitive verb
make invalid
invalidity.noun
invalidly.adverb

innovate, innovated, innovating, innovates.verbs
transitive verb use.to introduce new methods, devices, etc.; make changes; to begin or introduce (something new) for or as if for the first time
intransitive verb use to begin or introduce something new
innovator.noun
innovatory.adjective
innovative.adjective
marked by or given to innovations
innovativeness.noun
innovation.noun
the act of introducing something new; something newly introduced
innovational.adjective

incessant.adjective
continuing or following without interruption; unceasing; continual
incessantly.adverb-

insinuate.verb
inflected form(s).insinuated; insinuating
transitive verb senses.to introduce (as an idea) gradually or in a subtle, indirect, or covert way (insinuate doubts into a trusting mind); suggest; to impart or communicate with artful or oblique reference; to introduce (as oneself) by stealthy, smooth, or artful means 
insinuative.adjective
insinuator.noun

interstellar.adjective
located, taking place, or traveling among the stars especially of the Milky Way.galaxy

ISBN is International Standard Book Number

infrastructure.noun
underlying structure or basic framework; the basic facilities, services, and installations needed for the functioning of a community or society, such as transportation and communications systems, water and power lines, and public institutions including schools, post offices, and prisons

innocuous.adjective
harmless, not hurtful
innocuousness, innocuity.nouns
innocuously.adverb

impervious.adjective
not penetrable; not open or receptive
imperviously.adverb
imperviousness.noun

inappropriate.adjective
unsuitable or improper; not appropriate
inappropriately.adverb
inappropriateness.noun

insect.noun
any of numerous usually small arthropod animals of the class Insecta, having an adult stage characterized by three pairs of legs and a body segmented into head, thorax (the second or middle region of the body of an arthropod, between the head and the abdomen), and abdomen and usually having two pairs of wings. Insects include the flies, crickets, mosquitoes, beetles, butterflies, and bees; any of various similar arthropod animals, such as spiders, centipedes, or ticks.

imprimatur.noun
official approval or license to print or publish, especially under conditions of censorship; official approval; sanction; a mark of official approval

insoluble.adjective
that cannot be dissolved; difficult or impossible to solve or explain; insolvable
insolubility or insolubleness, insoluble-nouns
insolubly.adverb

insofar.adverb
to such an extent

inasmuch as.conjunction
because of the fact that; since; to the extent that; insofar

insomuch as.conjunction
to such extent or degree as; inasmuch as; since

intercalate, intercalated, intercalating, intercalates.transitive verbs
to insert (a day or month) in a calendar; to insert, interpose, or interpolate
intercalation.noun
intercalative.adjective

indict, indicted, indicting, indicts.transitive verbs.(pronounced 'in dite)
to accuse of wrongdoing; charge (a book that indicts modern values)
Law.-.to make a formal accusation or indictment against (a party {a person or a group}) by the findings, especially a grand jury; to accuse of wrongdoing; charge (a book that indicts modern values)
indictee.noun
indicter.or.indictor.noun

indictment.noun
Law.-.a written statement charging a party (a person or a group) with the commission of a crime or other offense, drawn up by a prosecuting attorney and found and presented by a grand jury; the act of indicting; the condition of being indicted

indisputable.adjective
beyond dispute or doubt; undeniable (indisputable evidence) indisputableness.noun
indisputably.adverb

indeterminate.adjective
not precisely determined, determinable, or established (a person of indeterminate age); not precisely fixed, as to extent, size, nature, or number (an indeterminate number of plant species in the jungle); lacking clarity or precision, as in meaning; vague; not fixed or known in advance (an indeterminate future); not leading up to a definite result or ending (an indeterminate campaign)
indeterminately.adverb
indeterminateness.or.indetermination.noun

intermediate.adjective
lying or occurring between two extremes or in a middle position or state (an aircraft having an intermediate range, an intermediate school)
intermediate.noun
one that is in a middle position or state; an intermediary; an automobile that is smaller than a full sized model but larger than a compact
intermediate, intermediated, intermediating, intermediates.intransitive verbs
to act as an intermediary; mediate; to intervene
intermediacy, intermediateness, intermediation, intermediator.nouns
intermediately.adverb

intermediary.adjective
existing or occurring between; intermediate; acting as a mediator or an agent between persons or things
intermediary.noun,.plural.intermediaries
one that acts as a mediator; one that acts as an agent between persons or things; a means; an intermediate state or stage

ideology.noun, plural.ideologies
the body of ideas reflecting the social needs and aspirations of an individual, a group, a class, or a culture; a set of doctrines or beliefs that form the basis of a political, economic, or other system
ideologist.noun

id.noun
in Freudian theory, the division of the psyche that is totally unconscious and serves as the source of instinctual impulses and demands for immediate satisfaction of primitive needs

indeed.adverb
without a doubt; certainly (very warm indeed; was indeed grateful); in fact; in reality (said the car would make the trip ok, and indeed it did)
indeed.interjection
expressing surprise