Relating to or imposed as a form of discipline or punishment.
From disciplinate + -ory (suffix forming adjectives meaning 'relating to' or 'serving for'). The -ory suffix comes from Latin -orius. This is a more emphatic variant of disciplinative, though both are formal and uncommon in modern usage.
English has multiple ways to say 'relating to discipline'—disciplinary, disciplinative, disciplinatory—which shows how language develops overlapping synonyms that slowly get winnowed down; today, 'disciplinary' has almost completely won out.
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