Etymology
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expatiate (v.)

1530s, "walk about, roam freely," from Latin expatiatus/exspatiatus, past participle of expatiari/exspatiari "wander, digress, wander from the way; spread, extend," from ex "out" (see ex-) + spatiari "to walk, spread out," from spatium (see space (n.)). Meaning "talk or write at length" is 1610s. Related: Expatiated; expatiating.

updated on October 14, 2021

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Definitions of expatiate from WordNet

expatiate (v.)
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing;
Synonyms: elaborate / lucubrate / exposit / enlarge / flesh out / expand / expound / dilate
From wordnet.princeton.edu, not affiliated with etymonline.