An easy way to remember that the prefix ex- means “out” is through the word exit, for when you exit a room, you go “out” of it. Prefixes are key morphemes in English vocabulary that begin words. The prefix ex-, with its variants e- and ec-, mean “out.” Ex- is the most common form of this prefix.

What words have the prefix out?

• outnumber.
• outwit.
• outgrow.
• outlive.

Is the a prefix?

Noun classPrefix10e-N-/zi-