1
: said or done in such a way that others know exactly what you mean
We'll need a definite answer by Tuesday.
The answer is a definite no.
2
: not likely to change : already set or decided
Are her plans definite?
I don't know anything definite yet.
The teacher sets definite standards for her students.
3
not used before a noun
: confident or certain about doing something or that something will happen
She seems to be pretty definite about leaving.
I am definite that we will win.
Cite this Entry
“Definite.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/definite. Accessed 10 Apr. 2026.
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