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The Collaborative International Dictionary
Vaniloquence

Vaniloquence \Va*nil"o*quence\, n. [L. vaniloquentia; vanus vain + loquentia talk, loqui to speak.] Vain or foolish talk. [Obs.]

Douglas Harper's Etymology Dictionary
vaniloquence

"idle talk," 1620s, from Latin vaniloquentia, from vanus "idle, empty" (see vain) + loquens, from loqui "to speak" (see locution).

Wiktionary
vaniloquence

n. idle or vain talk.