Dic: definite (how it can be defined)

I.
[Collins 3] known for certain; sure
[OALD 1] definite (that…) △sure or certain; unlikely to change
[COBUILD 1] If something such as a decision or an arrangement is definite, it is firm and clear, and unlikely to be changed.

• Can you give me a definite answer by tomorrow? 
• Is it definite that he's leaving?
• I've heard rumours, but nothing definite.
• a definite offer of a job
• I'm not sure—I can find out for definite if you like.
• That's definite then, is it?
• They have very definite ideas on how to bring up children.
•  It's too soon to give a definite answer.
• Her Royal Highness has definite views about most things.
• She made no definite plans for her future.

II.
[Collins 1] clearly defined; exact; explicit
[OALD 2] easily or clearly seen or understood; obvious (= clear)
[COBUILD 2] usu ADJ n △Definite evidence or information is true, rather than being someone's opinion or guess.

• The look on her face was a definite sign that something was wrong.
• There was a definite feeling that things were getting worse.
• We didn't have any definite proof.

III.
[OALD 3] (not before noun) definite (about something)| definite (that…) △(of a person) sure that something is true or that something is going to happen and stating it to other people
[COBUILD 4] Someone who is definite behaves or talks in a firm, confident way.

• I'm definite about this.
• Mary is very definite about this.

IV.
CF. [Collins 2] having precise limits or boundaries
CF. [COBUILD 3] ADJ n △You use definite to emphasize the strength of your opinion or belief. (= real)

• There has already been a definite improvement.
• That's a very definite possibility.