主(あるじ)head (of a household), proprietor (of a store), proprietress, landlord, landlady, master (of a servant), entertaining someone as one's guest

一家(いっか)の主(あるじ)である父(ちち)には威厳(いげん)がある。

The father, who is the head of the family, has dignity.

彼(かれ)は一(いち)国(くに)の主(あるじ)で百(ひゃく)万(まん)人(にん)の国民(こくみん)を治(おさ)めている。

He is the head of a nation and governs a million people.

先生(せんせい)：「このゲーム機(き)の主(あるじ)は誰(だれ)ですか？白状(はくじょう)しなさい！」

Teacher: "Who is the owner of this game console? Confess!"

旅館(りょかん)の主(あるじ)が亡(な)くなったことで旅館(りょかん)は経営(けいえい)をやめることになりました。

The proprietor of the inn passed away, which led to the inn ceasing its operations.

一家(いっか)の主(あるじ)らしく威厳(いげん)を保(たも)つとともに妻(つま)や子供(こども)と対等(たいとう)でいる事(こと)も心(こころ)がけている。

He strives to maintain his dignity as the head of the family while also being mindful of treating his wife and children as equals.