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in- (il-, ir-, im- (Latin: in, into, within, inside, on, toward; used as a prefix).

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. Note the differences between this in- and the previous one.

illuminate:
imbibe:
immigrate:
import:
inaugurate:
incalescent:
incandescent:
inflammable:
inject:
inscribe:
irradiate: