bi-annual, semi-annual.
The word annual (yearly) is from Middle English annuel, based on the Latin word annus, "circuit of the Sun".
There is no prefix for the word annual. The word means yearly. However, if you add the prefix "semi" in front of it, it means it is done every six months.
The word 'annual' is a noun, a singular, common noun; a word for a periodical published yearly; a yearbook; a plant that completes its entire life cycle in a single growing season.
The suffix of "annual" is annually"
annul or annuo
semiannual
The prefix 'im' can added to make the word impolite.
"Possibility" doesn't have a prefix. You could add the prefix im- to it to make the word impossibility.
asymmetricantisymmetric
pre
unrational
The adding a prefix to the word "add" would result in the word "postadd".
In the word "inform", in- is a prefix. You could add the prefix mis- to it to get misinform.
If you add a prefix to a word, you can change the meaning.
You could add the prefix mis- to it to make the word misfits.
The prefix 'im' can added to make the word impolite.
"Possibility" doesn't have a prefix. You could add the prefix im- to it to make the word impossibility.
Pre-The prefix for prefix is pre; because it's before the root word fix.
un-
Misspelled
mis
asymmetricantisymmetric
disterrestrial