Non- Definition

nō

prefix

Not.

Noncombatant.

American Heritage

Used in the sense of not, to negate the meaning of the word to which it is prefixed.

Wiktionary

Prevocalic form of nona-

Wiktionary

adverb

No.

Webster's New World

Obsolete form of none.

Wiktionary

Synonyms:

affix

Not.

Webster's New World

The opposite of.

Nonessential.

Webster's New World

Excluded (from a specified category)

Nonvoter, nonfiction.

Webster's New World

Refusal or failure.

Noncooperation.

Webster's New World

Having the superficial aspect, but not the real value, of.

Nonbook, nonevent.

Webster's New World

Origin of Non-

From Latin non, from Old Latin noenu, noenum, from neoenum (“not one"). See none.

From Wiktionary
Middle English from Old French from Latin nōn not ne in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition
From Latin nona (“nine").

From Wiktionary