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-atory

1.
a combination of -ate1. and -ory1. or -ory2 , used infrequently as an independent suffix with the same senses as -ory1. and -ory2 : affirmatory; observatory .
Origin
< 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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -atory

-atory

suffix
1.
of, relating to, characterized by, or serving to: circulatory, exploratory, migratory, explanatory
Word Origin
from Latin -ātōrius; see -ate1, -ory²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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