they're

[thair; unstressed ther]
contraction of they are.
their, there, they're (see usage note at there).


See contraction.
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World English Dictionary
they're (ðɛə, ˈðeɪə) [Click for IPA pronunciation guide]
 
contraction of
they are

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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00:10
They're is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
The patterns must be on the same scale as the wavelength of the light they're
  designed to interact with.
The organic molecules in each pixel emit light when they're electrically
  stimulated.
They're going to look to startups working on biofuels and new engine
  technologies.
Rather, the problem is that the student isn't learning what they're supposed to
  learn in your course.
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