around · circumference

1. Origins, structure, and basic meaning

• Structure: 周 expresses a circumference or surroundings; its on-reading is しゅう.
• Basic usage: 一周, read いっしゅう, means one circuit; 周り, read まわり, means the surrounding area.

2. Common pitfalls and similar expressions

• A complete circuit and the surrounding space
  • 池を一周して describes going once around a pond.
  • 池の周り identifies the space around the pond.