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.
A prefix is a group of letters added at the beginning of a word to change its meaning, such as adding "un-" to "happy" to make "unhappy".
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
The prefix that can be added to the word "terrestrial" is "extra-" to form the word "extraterrestrial." This term refers to something that is outside or beyond Earth's atmosphere or of extraterrestrial origin.