Both has 5 different meanings across 5 categories:
Adjective · Det · Pron · Conj · Proper Noun
Each of the two; one and the other; referring to two individuals or items.
Each of the two, or of the two kinds.
Including both of (used with and).
A surname.
The word "both" comes from Middle English and Old English, originally meaning "both the" or "both those." It shares roots with similar words in other Germanic languages like Dutch, German, and Swedish.