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Webster's Dictionary (1865)

Plăt'-i-tūde, n.

noun

(30), n. [Fr. from plat, flat. See PLAT, a.]

  1. Flatness; dullness; insipidity. “To hammer one golden grain of wit into a sheet of infinite platitude.” Motley.
  2. That which exhibits flatness or dullness; a weak or empty remark.