Late 19th century; earliest use found in The Century Dictionary. From mutate + -ory, perhaps after post-classical Latin mutatorius that may be changed (Vulgate).
Definition of mutatory in US English:
mutatory
adjective
rare
Mutable, variable; subject to change.
Origin
Late 19th century; earliest use found in The Century Dictionary. From mutate + -ory, perhaps after post-classical Latin mutatorius that may be changed (Vulgate).