in-

in- ¹ or il- or im- or ir-

pref.

Not: inarticulate. Before l, in- is usually assimilated to il-; before r to ir-; and before b, m, and p to im-. See Usage Note at un-¹.

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[Middle English, from Old French, from Latin; see ne in Indo-European roots.]

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in- ² or il- or im- or ir-

pref.

1. In; into; within: inundation. Before l, in- is usually assimilated to il-; before r to ir-; and before b, m, and p to im-.

2. Variant of en-¹.

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[Middle English, from Old English (from in, in; see in¹) and from Old French (from Latin, from in, in, within; see en in Indo-European roots).]

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in-¹, il-, im-, ir-

prefix

not; non- incredible insincere illegal imperfect irregular Compare un-¹

[from Latin in-; related to ne-, nōn not]

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in-², il-, im-, ir-

prefix

1. in; into; towards; within; on infiltrate immigrate

2. having an intensive or causative function inflame imperil

[from in (prep, adv)]