plural of circle progression

(anatomy) A circle of arteries at the base of the brain that is formed by the cerebral and communicating arteries and is a site of aneurysms.

An astronomical instrument for measuring angles, like the sextant or Hadley's quadrant, by the reflection of light from two plane mirrors which it carries, and differing from the sextant chiefly in having an entire circle.

A gallery in a theater, generally the one containing the prominent and more expensive seats.

A gallery in a theater, generally one containing inexpensive seats. / The social circle comprising one's family.

(baseball) A pitch thrown with a grip where the pitcher makes a circle with the index finger, holding the thumb at the bottom of the ball parallel to the middle finger and holding the ball far out in the hand.

plural of circle jerker

Someone who engages in a circle jerk

The natural cycle of procreation, birth, life, death and predation.

A ritual in which participants join hands in a circle and pray for something, often as part of a vigil.