時效 [时－]

Jyutping si4 haau6
Pinyin shí xiào

Definitions (CC-CEDICT)
  1. timeliness
  2. period of viability or validity
  3. (law) prescription; limitation
  4. (metallurgy) aging
Definitions (Wiktionary)
  1. noun
    effectiveness for a given period of time
  2. noun
    prescription; limitation
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）