unisexs
unison
Universal.
uni word means to sing together as one
uni
unicycle
Uni or mono.
The prefix "uni-" in the word unicellular means one or single. Therefore, unicellular refers to an organism or structure consisting of a single cell.
Unique.
The word you are looking for is "unite." It comes from the Latin root "uni," meaning "one."
The affix in the word uniform(s) is uni- which is in Latin unus, una and unum. Unus, una and unum means one in Latin! Uni- means one/singular.
University, singular. Universities, plural.