Definition of promissorily in US English:

promissorily

adverb

Law
  • In a promissory manner; in the manner of a promise.

Origin

Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From promissory + -ly.

Pronunciation

promissorily

/ˈprɒmɪs(ə)rɪli/