in- 2 (il-, ir-, im-), "in, into", etc.
(Latin: in, into, within, inside, on, toward: include, incur, invade; also, used intensively, as in inflame and inflammable, or without perceptible force.)
The in- changes or is assimilated to il- before l, as with "illuminate", to im- before b, as with "imbibe"; before m, as with "immediate"; before p, as with "implant"; and to ir- before r, as with "irrigate".
The form generally remains unassimilated in words formed in English; such as, inbreed.
Don't confuse this in-2, meaning "in, into, within", etc. with the Latin prefix in-1 meaning "not" nor with the prefix for English-origin words in-3 meaning "in, into; within".
illuminate
1. To make something visible or bright with light, or be lit up.
2. To decorate something with lights for a celebration.
3. To make something clear, or easier to ulnderstand and to appreciate.
4. To add colored letters, illustrations, and designs to a manuscript or the borders of a page.
5. To provide someone with knowledge or with intellectual or spiritual enlightenment.
imbibe, imbibed
1. To drink.
2. To drink alcoholic beverages.
3. To absorb or take in as if by drinking: “The whole body ... imbibes delight through every pore” (Henry David Thoreau).
4. To receive and absorb into the mind: “Gladstone had ... imbibed a strong prejudice against Americans” (Philip Magnus).
5. To permeate; saturate.
immigrate
1. To enter a new country for the purpose of settling there.
2. To bring people into country and to settle them as permanent residents there.
3. To move an individual or group into a new population or geographical region.
4. In botany and zoology; to become established in a new environment.
Immigrate describes the movement which is relative to a destination or going into a country.
import
That which is imported or brought in; a commodity imported from abroad; as opposed to export.
inaugurate
1. To make a formal beginning of; to initiate; to commence; to begin: "The end of World War II inaugurated the era of nuclear power."
2. To induct into office with formal ceremonies; to install.
3. To introduce into public use by some formal ceremony: Airmail service between Washington, D.C., and New York City was inaugurated in 1918.
4. Etymology: From Latin
inaugurātus; past participle of
inaugurāre, "to consecrate by augury" (a person chosen for the priesthood or other office; literally, "to take auguries").
The word inaugurate has its roots in the Latin term meaning, "to practice augury". In ancient Rome, a select few priests were charged with observing the flight and feeding of birds in order to discover signs of the future.
Such observations were known as auguries, and the practitioners of this art as augurs. For a few hundred years, the now-obsolete augurate meant, "to make an augury".
Presumably, it was the ceremonial connotation of auguring and not its "foretelling aspects" that brought inaugurate into print in English in 1606, with the meaning, "to induct into an office with suitable ceremonies".
incalescent
incandescent
inflammable
1. Something that is quickly and easily set on fire and burned.
2. Capable of being set on fire; combustible; flammable.
3. Easily aroused or excited, as to passion or anger; irascible: "Her father had an inflammable disposition regarding the men she was dating."
inject
inscribe
1. To write, mark, or delineate (words, a name, characters, etc.) in or on something; especially, so as to be conspicuous or durable, as on a monument, tablet, etc.
2. To write or enter the name of (a person) upon an official document or list; to enroll.
3. To dedicate (a writing or work of art) to a person by a short inscription (placed at the beginning of a writing, or beneath a picture, etc.), less formal than an ordinary dedication.
irradiate
1. To expose someone to or to treat something with radiation or streams of particles.
2. To treat food with electromagnetic radiation or to kill microorganisms and slow down the process of ripening and gradual deterioration or rotting.
3. To make something brighter by shining light onto it.
4. To make something intellectually clear.