valid

Academic Word List, sublist 3.

About 21.04 uses per million words.

Meaning

1. adjective Well-grounded or justifiable, pertinent.

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

2. adjective Acceptable, proper or correct; in accordance with the rules.

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

3. adjective Related to the current topic, or presented within context, relevant.
4. adjective Of a formula or system: such that it evaluates to true regardless of the input values.
5. adjective Of an argument: whose conclusion is always true whenever its premises are true.

   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.

6. adjective Genuine - as distinguished from efficient or regular - sacrament.

Similar words

validated reasoned well-grounded legitimate logical binding legal sound unexpired justified

Often followed by

for and in only as if reason to or

Word family

validate validated validating validation validity validly