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a combination of -ate1 and -ory1 or -ory2, used infrequently as an independent suffix with the same senses as -ory1 and -ory2: affirmatory; observatory.
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IS and ARE are both forms of which verb?

Origin of -atory

<Latin -ātōrius,-a,-um, originally the termination of adjectives formed with -tōrius (see -tory1, -tory2) and verbs whose stems ended in -ā-; reanalyzed in English in the same way as -ator
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How to use -atory in a sentence

British Dictionary definitions for -atory


suffix forming adjectives
of, relating to, characterized by, or serving tocirculatory; exploratory; migratory; explanatory

Word Origin for -atory

from Latin -ātōrius; see -ate 1, -ory ²
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