D defs.my
Entry 3 senses Webster, 1913

Cautionary

/kôsh'-ən-ĕrˌ-ē/ · Cau·tion·a·ry · IPA /ˈkɔʃəˌnɛɹi/
01 a. Conveying a caution, or warning to avoid danger; as, cautionary signals.
  1. 1.
    Conveying a caution, or warning to avoid danger; as, cautionary signals.
  2. 2.
    Given as a pledge or as security.
    “He hated Barnevelt, for his getting the cautionary towns out of his hands.” Bp. Burnet.
  3. 3.
    Wary; cautious.[Obs.]