The prefix in- can mean "not" as in inedible, lit. not able to be eaten. Variants of -in are ig-, im-, il-, and ir-; i.e. ignominous, impossible, illegitimate, irresponsible.
English being full of surprises in- can also mean "in, up, towards, and on". (into, innate, indicate, indict)
If you want to remember this and all the prefixes that mean "not" I have a
couple of mnemonics that may be of help.
1) You're having a hell of a time trying to get your schools letters ironed on your t-shirt and don't want to be interrupted. You tell your friend Iggie, "Iggie, I'm not in until I iron on an A". (ig-, im-, (not), in-, un-, il-, ir-, non-, an-, a-)
2) in-, im- (You're a doctor.) One of your patients in the Psych Ward is going in his room and says, "I'm in." (im-, in-, nr.) Then he comes out and says, "I'm not in". Then "I'm in," again. Then "I'm not in," again. You go up towards him to see what medication this NUT is on. (not, up, towards, on)
what is the prefix meaning of in
the prefix for unlike is -un
The prefix meaning foreign is "exo-".
The prefix meaning height is Acro-
prefix
The prefix meaning "billion" is "giga-".
prefix meaning fast
"Neo-" is a prefix meaning modern.
The prefix is fore-. It means before or predict.
what is the prefix meaning of in
Oct- is the prefix meaning eight. One of the most common words for this is octagon.
It consists of the prefix com, meaning "together", & templum, meaning "temple" .