1. number (in a series)
私の席は五番です。My seat is number five.
2. (one's) turn
じゃあ次は私の番だな。Well then, it's my turn next.
3. watch; guard; lookout
母に店の番を頼まれた。My mother asked me to watch the shop.
4. rank; standing; position
5. bout; match
6. pieces (in a collection)