Conforming to the law; lawful, legal, legitimate under the law or statutes.
そのビジネスは現行法の下で合法と判断された。
That business was judged to be legal under current law.
合法な手続きを経て土地が売買された。
The land was bought and sold through legal procedures.
合法かどうか弁護士に相談した方がいい。
You should consult a lawyer to see if it's legal.