accomplish, perform, fulfill

regulation, adjustment

regulate, adjust

role

important, significant

importance, consequence, significance

(attributive) the state of being shaped like a circle or ring; annularity, orbicularity, circularity, cyclicality, cricoidness, etc.

physical tension, strain / mental strain, nervousness / tension in a relationship / the contracted state of a muscle

be physically tense / be mentally tense, be nervous / for a relationship to suffer tension / for a muscle to contract

(anatomy) a cricothyroid muscle