際 means “edge, occasion”

さい · sai

Also: side, verge

Kun'yomi (Japanese reading)
きわ
On'yomi (Chinese reading)
サイ

JLPT N3 · Taught in grade 5 · 14 strokes

The story

A festival (祭) at the edge of a hill (阝): picture the crowd where two villages meet. 際 is an edge or meeting point: 国際 is international, 実際 is in reality, and 窓際族 are office workers sidelined to the window seats.

Used in 国際 (kokusai, international), 実際 (jissai, in reality), and 窓際 (madogiwa, by the window)

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