Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To speak or write at length: expatiated on the subject until everyone was bored.
  • intransitive v. To wander freely.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To range at large, or without restraint.
  • v. To write or speak at length; to be copious in argument or discussion, to descant.
  • v. To expand; to spread; to extend; to diffuse; to broaden.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To range at large, or without restraint.
  • intransitive v. To enlarge in discourse or writing; to be copious in argument or discussion; to descant.
  • transitive v. To expand; to spread; to extend; to diffuse; to broaden.

from The Century Dictionary and Cyclopedia

  • To move at large; rove without prescribed limits; wander without restraint.
  • To enlarge in discourse or writing; be copious in argument or discussion: with on or upon.
  • To allow to range at large; give free exercise to; expand; broaden.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Etymologies

Latin expatiārī, expatiāt- : ex-, ex- + spatiārī, to spread (from spatium, space).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the participle stem of Latin expatiari, from ex- + spatiari ("walk about"). (Wiktionary)

Examples

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