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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."

Examples of expatiate in a Sentence

the naturalist is known for her willingness to expatiate on any number of issues relating to wildlife and the environment

Recent Examples on the Web With wit and elan to spare, Greene expatiates on the intrigue that ensues when David Sparsholt, an engineering student with a fiancée, Connie, and a plan to join the Royal Air Force, arrives at Oxford in 1940. — Priscilla Gilman, BostonGlobe.com, 9 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'expatiate.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.