negotiatory
/nɪˈɡəʊʃ(ɪ)ət(ə)ri/ /nɪˈɡəʊsɪət(ə)ri/(also negociatory) rare before 20th cent
adjective
Relating to negotiation.
Origin
Early 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From negotiate + -ory.