Mid 17th century; earliest use found in Edward Leigh (1603–1671), writer. From post-classical Latin acclamatorius relating to or expressing acclamation from classical Latin acclāmāt-, past participial stem of acclāmāre + -ōrius.
Definition of acclamatory in US English:
acclamatory
adjectiveəˈklamət(ə)ri
Relating to or expressing acclamation.
Origin
Mid 17th century; earliest use found in Edward Leigh (1603–1671), writer. From post-classical Latin acclamatorius relating to or expressing acclamation from classical Latin acclāmāt-, past participial stem of acclāmāre + -ōrius.