1. average; medium; common; ordinary
なるほど、この男は並みの人間ではないらしい。I see, this man doesn't seem to be an ordinary person.
2. mid-grade (item); regular grade
3. same level as; equal to; equivalent to; on par with
その速度は車並みだ。That speed is on par with a car.
4. each (e.g. month); every
5. row of (teeth, houses, etc.); line of