noun, noun or participle which takes 'suru', intransitive verb
one round; one circuit; one lap; one revolution
Used for completing one full circuit of a track, course, or circular path; also for one full rotation. Common with する to mean 'go around once'.
公園の周りを一周した。
I went one lap around the park.
地球は太陽の周り
It takes one year for the Earth to make one revolution around the sun.