Average; ordinary; common — not particularly good or bad.
彼の成績は並だが、いつも努力している。
His grades are average, but he always works hard.
並の人にはできない仕事だ。
This is work that ordinary people can't do.
並で満足するつもりはない。
I don't intend to be satisfied with being average.
Mid-grade; standard level — a regular or middle grade of an item (below top-tier).
このホテルは一流ではなく、設備は並だ。
This hotel is not first-class; its facilities are average.
並のワインでも十分楽しめる。
Even mid-grade wine can be enjoyable enough.
As a suffix (〜並み): indicates being on the same level as; equivalent to; comparable to.
彼はプロ並みの腕前だ。
He has skills on a professional level.
彼女の料理は母親並みだ。
Her cooking is on par with her mother's.
その歌手は世界的スター並みの人気がある。
That singer enjoys popularity on par with global stars.
As a suffix, sometimes used to mean 'each' or 'every' (e.g. each month) — a limited or compound usage, sometimes archaic.
この会は月並に開かれている（※「月並」は『毎月』の意で用いられることがある）。
This meeting is held monthly (note: '並' here can be used to mean 'monthly').
A row or line of things (e.g. a row of houses, trees); the appearance of objects lined up.
海辺の家並みを散歩した。
I walked along the row of houses by the sea.
古い通りの家並みが保存されている。
The rows of houses on the old street have been preserved.