condition

A logical clause or phrase that a conditional statement uses. The phrase can either be true or false.

A requirement or requisite.

"Environmental protection is a condition for sustainability.   What other planets might have the right conditions for life?   The union had a dispute over sick time and other conditions of employment."

A clause in a contract or agreement indicating that a certain contingency may modify the principal obligation in some way.

To subject to the process of acclimation.

"I became conditioned to the absence of seasons in San Diego."

To subject to different conditions, especially as an exercise.

"They were conditioning their shins in their karate class."

To place conditions or limitations upon.