Definition of subitize in English:

subitize

(also subitise)

verb

Psychology
  • no object And with object. To apprehend (the number of things contained in a small sample) immediately, without needing to count.

Origin

1940s. From classical Latin subitus subite + -ize. On the circumstances of coinage see quot. 1949.

Pronunciation

subitize

/ˈsʌbətʌɪz/