verb (used without object), subitized, subitizing. Psychology.
to perceive at a glance the number of items presented, the limit for humans being about seven.
Also, especially British, subitise.

1949; < Latin subit(us) sudden or Late Latin subit(āre) to appear suddenly (see subito) + -ize Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subitize or subitise (ˈsʌbɪˌtaɪz)
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
[C20: from Latin subitus sudden + -ize]
subitise or subitise
[C20: from Latin subitus sudden + -ize]

Collins English Dictionary - Complete & Unabridged 10th Edition
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