English

Prefix

ac-

1. Relating to an oak, used in place names.

Usage notes

• It is not part of the etymology of acorn.

Etymology 2

• Around 1500 the c was added to some versions of the a- prefix.
• From Middle English a-, from Old French a-, from Latin ad- ‎(“to, toward”).

Prefix

ac-

1. (rarely productive) To; toward.

Usage notes

• alternate form of ad-
• Used when the root word started with a "c", "k", or a "q".

Latin

Prefix

ac-

1. Alternative form of ad-

   Occurs when ad- is prefixed to a word beginning with the letter c or q (accēdō, acceptō, accessiō, acquiēscō, etc.)