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Related to expatiation: placated
intr.v. ex·pa·ti·at·ed, ex·pa·ti·at·ing, ex·pa·ti·ates
1. To speak or write at length: expatiated on the subject until everyone was bored.
2. To wander freely.
[Latin expatiārī, expatiāt- : ex-, ex- + spatiārī, to spread (from spatium, space).]