在(あ)りexisting (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have

家族(かぞく)旅行(りょこう)で沖縄(おきなわ)に行(い)くのはありだ。

Going to Okinawa on a family trip is acceptable. {existing (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have}

先輩(せんぱい)：「焼肉(やきにく)行(い)く？」後輩(こうはい)：「ありです！」

Senior: "Shall we go for barbecue?" Junior: "That's acceptable!" {existing (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have}

三(さん)歳(さい)の娘(むすめ)が「蟻(あり)、そこに在(あ)り」と駄洒落(だじゃれ)を言(い)った。

My three-year-old daughter made a pun, saying "The ant is there," which also sounds like "The ant is existing." {existing (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have}

そのような事情(じじょう)であれば、責任(せきにん)は我(わ)が社(しゃ)に在(あ)りと言(い)わざるを得(え)ない。

If that's the situation, we cannot deny that the responsibility lies with our company. {existing (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have}

僕(ぼく)の提案(ていあん)に対(たい)して上司(じょうし)が「それは在(あ)りだね。」と賛同(さんどう)の意(い)を示(しめ)してくれた。

My boss showed agreement to my proposal by saying, "That's acceptable." {existing (at the present moment), alright, acceptable, passable, to be (usu. of inanimate objects), to have}