WordReference Random House Learner's Dictionary of American English © 2015
they'll /ðeɪl/USA pronunciation  
  1. contraction. a shortened form of they will:They'll probably be late because of the snow.

WordReference Random House Unabridged Dictionary of American English © 2015
they'll  (ᵺāl), 
  1. Pronounscontraction of they will.
See contraction. 

Collins Concise English Dictionary © HarperCollins Publishers::

they'll /ðeɪl/ contraction of
  1. they will or they shall

'they'll' also found in these entries:
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