Definition of "expatiate" [ex•pa•ti•ate]

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Godwin offers a glowing description of this future state, where all people share equally in the "bounties of nature" and are free to "expatiate" in the realms of intellectual discovery:"
• "And why would we need a critic to expatiate on his/her emotional reactions in this way?"
• "Really there is no need to expatiate upon the change, except to point out that social media by its very nature engages this cultural shift."