Question

use the definition of this root to explain the meaning of these words: circa: __ circus: circuit: circumference: circadian: __

Explanation:

The root "circ -" or "circu -" means circle or round. "Circa" means approximately (as if rounding to a value). "Circus" is a place with a circular - shaped arena for shows. "Circuit" is a circular path for electricity or a round - trip route. "Circumference" is the length around a circle. "Circadian" relates to a roughly 24 - hour cycle, which is like a round - the - clock rhythm.

Answer:

circa: approximately
circus: a place with a circular arena for shows
circuit: a circular path (e.g., for electricity)
circumference: the length around a circle
circadian: relating to a roughly 24 - hour cycle