1. Noun

   one's father; one's old man; dad; pops

   Usually written using kana aloneFamiliar language

   親父はじっと私の顔を見た。

2. middle-aged (or older) man; old man; geezer

   Usually written using kana aloneFamiliar language

3. one's boss

   Usually written using kana aloneFamiliar language

4. proprietor (of a restaurant, store, etc.); landlord

   Usually written using kana alone

5. grizzly bear

   Usually written using kana aloneHokkaido dialect

Also written 親爺【おやじ】oyaji、親仁【おやじ】oyaji