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[sim-uh-ler] /ˈsɪm ə lər/
having a likeness or resemblance, especially in a general way:
two similar houses.
Geometry. (of figures) having the same shape; having corresponding sides proportional and corresponding angles equal:
similar triangles.
Mathematics. (of two square matrices) related by means of a similarity transformation.
Origin of similar
1605-15; earlier similary < French similaire or Medieval Latin similāris, equivalent to Latin simil(is) like, similar (akin to simul together; cf. simplex) + -āris -ar1
Related forms
similarly, adverb
nonsimilar, adjective
nonsimilarly, adverb
quasi-similar, adjective
quasi-similarly, adverb
self-similar, adjective
unsimilar, adjective
unsimilarly, adverb
1. like, resembling. See same.
1. different. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unsimilar
Historical Examples
  • They looked at each other, in fact, being much of an age, and not unsimilar in worldly means just at the present moment.

    Salem Chapel, v.1/2 Mrs. Oliphant
  • The course of Spain, and that of the Italian States, have been not unsimilar.

  • I flatter myself that "not unsimilar abundance" is eminently Milvertonian.

  • Of Haydn's early days we have already spoken, and those of Mozart were not unsimilar.

    The Pianoforte Sonata J.S. Shedlock
British Dictionary definitions for unsimilar


showing resemblance in qualities, characteristics, or appearance; alike but not identical
(geometry) (of two or more figures) having corresponding angles equal and all corresponding sides in the same ratio Compare congruent (sense 2)
(maths) (of two classes) equinumerous
Derived Forms
similarity (ˌsɪmɪˈlærɪtɪ) noun
similarly, adverb
Usage note
As should not be used after similar: Wilson held a similar position to Jones (not a similar position as Jones); the system is similar to the one in France (not similar as the one in France)
Word Origin
C17: from Old French similaire, from Latin similis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unsimilar



"having characteristics in common," 1610s (earlier similary, 1560s), from French similaire, from a Medieval Latin extended form of Latin similis "like, resembling," from Old Latin semol "together," from PIE root *sem- (1) "one, as one, together with" (see same). The noun meaning "that which is similar" is from 1650s. Related: Similarly.

Online Etymology Dictionary, © 2010 Douglas Harper
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