与 (yǔ) — (conjunction) and (formal, connecting nouns); (preposition) with, together with (formal)

Formal 'and / with' — read it mainly in writing; in speech use 和 or 跟. 以及 is a slightly more formal list-connector for items in a series.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 與; 与 is its simplified writing.

The traditional form 與 is built from 舁 and 牙, and both parts give the sound.