Serving the purpose of explaining or clarifying; designed to shed light on something.
From 'elucidate' plus the suffix '-ory' (variant of '-ive', from Latin meaning 'serving to' or 'relating to'). It's essentially a formal synonym for 'elucidative' with a slightly more formal tone.
Both 'elucidative' and 'elucidatory' exist as synonyms, which shows how English loves redundancy — we often have multiple forms of the same word, giving writers choices for tone and emphasis rather than true meaning differences.
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