再 (zài) means “again; once more; re-; second; another; then (after sth, and not until then); no matter how ... (followed by an adjective or verb, and then (usually) 也 or 都 for emphasis)”. It is an HSK 2 Chinese character in the HSK 3.0 vocabulary.
再见!
Zàijiàn!
Goodbye!
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