What is definate?

I am assuming you are referring to the word "definite".

Definite is an adjective that means clear, specific, and certain. It is used to describe something that is distinct and separate from others, and is not open to interpretation or doubt.

For example, if you say "I have a definite plan for the weekend", it means you have a clear and specific plan that you intend to follow. If you say "There is a definite problem with the engine", it means there is a clear and certain issue with the engine that needs to be fixed.

The word "definite" can also be used in grammar to describe a specific type of article (the definite article "the"), which points to a specific noun or group of nouns.