a combination of -ate1. and -ory1. or -ory2, used infrequently as an independent suffix with the same senses as -ory1. and -ory2: affirmatory; observatory .

< Latin -ātōrius, -a, -um, orig. 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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suffix forming adjectives
of, relating to, characterized by, or serving to: circulatory; exploratory; migratory; explanatory
[from Latin -ātōrius; see -ate1, -ory²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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