Definition of promissive in US English:

promissive

adjective

Grammar
  • Conveying, implying, or having the character of a promise; especially (Grammar) designating a verbal mood which expresses a promise.

Origin

Mid 17th century; earliest use found in Naunton's Fragmenta Regalia. From post-classical Latin promissivus conveying, implying, or having the character of a promise from classical Latin prōmiss-, past participial stem of prōmittere + -īvus.

Pronunciation

promissive

/prə(ʊ)ˈmɪsɪv/