- in-
- in-in-1 [in][< the prep. IN1; also ME < OE inn & MFr in- or OFr en- < L in- < in: see IN1] prefixin, into, within, on, toward: also used as an intensifier in some words of Latin origin [inbreed, infer, induct, instigate]: it becomes il- before l; im- before b, m, or p; and ir- before rin-2 [in][ME < OFr & ML < L < IE * ṇ-, initial negative particle, var. of * ne, * nē- > NO1, L ne-] prefixno, not, without, non- [insignificant]: it becomes il- before l;im- before b, m, or p; and ir- before r
English World dictionary. V. Neufeldt. 2014.