及 means “reach, extend, and”

およぶ · oyobu

Also: reach out, exert, exercise, cause

Kun'yomi (Japanese reading)
およぶ, および, およぼす
On'yomi (Chinese reading)
キュウ

JLPT N1 · Taught in secondary school · 3 strokes

The story

In its oldest form 及 is a hand reaching a person from behind: someone caught up with. 及ぶ is to reach or extend to, 及び is the formal "and" of documents, 普及 is spreading to everyone, and 言及 is touching on a topic.

Used in 及ぶ (oyobu, to reach/extend to), 及び (oyobi, and/as well as), and 普及 (fukyuu, spread/popularization)

More from Formal Words

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.