Also ‑atory, ‑sory, ‑tory.
Relating to or involving an action.
Latin ‑orius, Latin -orius, sometimes via Anglo-Norman French ‑ori(e).
Examples are primarily adjectives. They often contain at, s, or t before the ending, derived from the stem of Latin precursor words. Some examples are compulsory, defamatory, mandatory, obligatory, preparatory, and sensory. They can sometimes also be nouns: accessory, purgatory. One that is now always a noun is directory.
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