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subitize

[soo-bi-tahyz]
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verb (used without object), su·bi·tized, su·bi·tiz·ing. Psychology.
  1. to perceive at a glance the number of items presented, the limit for humans being about seven.
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Also especially British, su·bi·tise.

Origin of subitize

1949; < Latin subit(us) sudden or Late Latin subit(āre) to appear suddenly (see subito) + -ize
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for subitise

subitize

subitise

verb
  1. psychol to perceive the number of (a group of items) at a glance and without countingthe maximum number of items that can be subitized is about five
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Word Origin

C20: from Latin subitus sudden + -ize
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