Sagacity is a noun that refers to wisdom or keen judgement.
The Latin word sagax (SA gacks) means ‘of quick perception’ or ‘keen.’ This word gave birth to our word of the day as well as ‘sage,’ a word often used to describe.a profound thinker who is eager to share a life of wisdom. When considering the use of sagacity, it may help to remember such a character is the kind with much sagacity.
The old wizard was happy to share his sagacity with his student. He felt there was no better use for wisdom than to pass it on to younger people who need it the most.