Meaning of 'in-' (Webster Dictionary)
- An inseparable prefix, or particle, meaning not, non-, un- as,
inactive, incapable, inapt. In- regularly becomes il- before l, ir-
before r, and im- before a labial.
- A prefix from Eng. prep. in, also from Lat. prep. in,
meaning in, into, on, among; as, inbred, inborn, inroad; incline,
inject, intrude. In words from the Latin, in- regularly becomes il-
before l, ir- before r, and im- before a labial; as, illusion,
irruption, imblue, immigrate, impart. In- is sometimes used with an
simple intensive force.