n.
1.the essential qualities or characteristics by which something is recognized
2.a causal agent creating and controlling things in the universe
3.the natural physical world including plants and animals and landscapes etc.
4.the complex of emotional and intellectual attributes that determine a person's characteristic actions and reactions
5.a particular type of thing
Idiom of the Day
catch on
to understand something, to learn about something
I was finally able to catch on and understand the math problem.