1. well grounded in logic or truth or having legal force

- a valid inference

- a valid argument

- a valid contract

Similar word(s): legitimate, reasonable, sensible, binding, effectual, legal, sound, legitimate, logical, reasoned, validated

2. still legally acceptable

- the license is still valid

Similar word(s): unexpired

Sentences with valid as an adjective:

- I will believe him as soon as he offers a valid answer.

- A valid format for the date is MM/DD/YY.

- Do not drive without a valid license.

- An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.