通牒

tōngdié
diplomatic note

CEDICT

diplomatic note

Wiktionary

两国交换意见或由一国通知对方，要求对方答覆的外交文书。

重編國語辭典

Entry Composition

1 通 tōng
  1. to go through
  2. to know well
  3. (suffix) expert
  4. to connect
  5. to communicate
  6. open
  7. to clear
  8. classifier for letters, telegrams, phone calls etc
2 牒 dié
  1. (official) document
  2. dispatch

Containing this entry

最后通牒 zuìhòutōngdié ultimatum