さい
occasion, time
The edge where one thing meets the next, which is the moment to say what you have been holding onto. The same さい as 実際, right out at the edge of it. Now, then: さい.
時 とき is a time in general and 機会 きかい is a chance to act. 際 is formal and marks an occasion: この際, at this juncture.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.