Mid 17th century; earliest use found in Thomas Fuller (1607/8–1661), Church of England clergyman. From reposit + -ary, probably as alteration of repository.
Definition of repositary in US English:
repositary
nounrɪˈpɒsɪt(ə)ri
Repository.
Origin
Mid 17th century; earliest use found in Thomas Fuller (1607/8–1661), Church of England clergyman. From reposit + -ary, probably as alteration of repository.