This is the 7190th most frequent Chinese word.
約
"約" means "to arrange, to promise, to restrict, or approximately."
In this context, '約' refers to a contract or formal agreement.
她和那家公司簽了工作約。
She signed a work contract with that company.
In this sentence, '約' signifies making an arrangement or appointment with someone to do something.
我今天約了朋友去看電影。
I arranged with a friend to go watch a movie today.
Here, '約' is used as part of the word '大約,' indicating approximation or estimation.