Summary: The prefix *mono-* and its variant *mon-*, which both mean "one," are important prefixes in the English language. For instance, the prefix *mono-* gave rise to the words [*mono*]logue and [*mono*]tonous, whereas we find its variant *mon-* in words such as [*mon*]archy and [*mon*]k. A [*mon*]archy, for instance, is rule by "one," whereas a [*mono*]syllabic word only has "one" syllable.
