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Jyutping gaa2
Pinyin

Definitions (Unihan)
  1. small (used in place names)
  2. Cangjie Input
    NSF

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Jyutping gaa1
Pinyin

Definitions (CC-CEDICT)
  1. little (dialect)
Definitions (Wiktionary)
  1. character
    Prefix used before a name to indicate affection, similar to 小.
  2. character
    small
  3. character
    money