a suffix of adjectives meaning `having the function or effect of', as in compulsory, contributory, declaratory, illusory.

{Latin -ōrius (neuter -ōrium. See -ory2), suffix of adjectives associated especially with agent nouns in -or. See -or2}
a suffix of nouns denoting especially a place or an instrument or thing for some purpose, as in directory, dormitory, purgatory.

{Latin -ōrium. See -ory1}

Australian English dictionary. 2014.

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