To form or cause to form crystals; to solidify into a crystalline structure with a regular repeating pattern.
From crystal + -ise (British verb suffix). French influence brought 'crystalize' to English in the 1600s; British spelling standardized it as 'crystallise' in the 1700s.
When ideas 'crystallise' in your mind, you're using the same metaphor as chemists—messy thoughts snap into clear, ordered understanding, just like atoms forming a perfect crystal.
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