Summary: Prefixes are key morphemes in English vocabulary that begin words. The prefix *con-*, which means "with" or "thoroughly," appears in numerous English vocabulary words, for example: [*con*]nect, [*con*]sensus, and [*con*]clude. An easy way to remember that the prefix *con* means "with" is through the word [*con*]nect, or join "with." A way to remember that it means "thoroughly" is through [*con*]clude, or "thoroughly" close a matter.
