Definition of expatiate
- expatiating upon the value of the fabric
- —Thomas Hardy
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the naturalist is known for her willingness to expatiate on any number of issues relating to wildlife and the environment
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The Latin antecedent of "expatiate" is "exspatiari," which combines the prefix ex- ("out of") with "spatiari" ("to take a walk"), itself from "spatium" ("space" or "course"). Exspatiari means "to wander from a course" and, in the figurative sense, "to digress." But when English speakers began using "expatiate" in 1538, we took "wander" as simply "to move about freely." In a similar digression from the original Latin, we began using "expatiate" in a figurative sense of "to speak at length." That's the sense of the word most often used these days, usually in combination with "on" or "upon."
: to speak or write about something in a way that includes a lot of details or uses many words
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