any of several gray, black, and white songbirds of the genus Mimus, especially M. polyglottos, of the U.S. and Mexico, noted for their ability to mimic the songs of other birds.
any of various related or similar birds, as Melanotis caerulescens (blue mockingbird) of Mexico.

1670–80, Americanism; mocking + bird Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mockingbird (ˈmɒkɪŋˌbɜːd)
1.  (Austral) any American songbird of the family Mimidae, having a long tail and grey plumage: noted for their ability to mimic the song of other birds
2.  a small scrub bird, Atrichornis rufescens, noted for its mimicry

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also mocking-bird, 1676; see mock (v.) + bird (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

mockingbird definition

Software that intercepts communications (especially login transactions) between users and hosts and provides system-like responses to the users while saving their responses (especially account IDs and passwords). A special case of Trojan horse.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
It may have been a mockingbird, they do live in the area.
And maybe one day we'll tip our hats to the mockingbird, not out of fear but out of friendliness.
The mockingbird in the tree next to our bedroom has learned an excellent imitation of our neighbor's car alarm.
Image for mockingbird
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