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subitize

[soo-bi-tahyz] /ˈsu bɪˌtaɪz/
verb (used without object), subitized, subitizing. Psychology
1.
to perceive at a glance the number of items presented, the limit for humans being about seven.
Also, especially British, subitise.
Origin
1949
1949; < Latin subit(us) sudden or Late Latin subit(āre) to appear suddenly (see subito) + -ize
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for subitize

subitize

/ˈsʌbɪˌtaɪz/
verb
1.
(psychol) to perceive the number of (a group of items) at a glance and without counting: the maximum number of items that can be subitized is about five
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
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