Give both forms of the prefix meaning one, single.

The two forms of the prefix meaning "one" or "single" are "uni-" and "mono-".

1. "Uni-" is a prefix meaning "one" or "single". It is derived from Latin. Examples of words using this prefix include "unicycle" (a cycle with one wheel), "unilateral" (pertaining to one side), and "universe" (which can be interpreted as everything combined into one).

2. "Mono-" is another prefix meaning "one" or "single". It is derived from Greek. Examples of words using this prefix include "monologue" (a speech by one person), "monotone" (a single, unvaried tone), and "monochrome" (one color).