‖In′ses‐so″res (?), n. pl. [NL., fr. L. insessor, lit., one who sits down, fr. incidere. See Insession.] (Zoöl.) An order of birds, formerly established to include the perching birds, but now generally regarded as an artificial group.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.