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- or ir-

prefix

a. not; non: incredible, illegal, imperfect, irregular

b. lack of: inexperience [Latin]

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in- ², il-, im- or ir-

prefix

in; into; towards; within; on: infiltrate [from in]