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Wiktionary(0.00 / 0 votes)Rate this definition: 1  subitize(Verb) to judge (the number of objects in a group) rapidly, accurately and confidently without counting them. 2  subitize(Verb) to have the ability of judging the number of objects in a group in this way.
WordReference Random House Learner's Dictionary of American English Â© 2017. -ize, suffix. -ize is used to form verbs with the meaning to make; cause to become:''fossil + -ize â fossilize (= to make something into a fossil); sterile + -ize â sterilize (= to make something sterile).