1. （书、戏剧、电影或故事中品行端正的）女主角，女主人公
    The heroine of a book, play, film, or story is the main female character, who usually has good qualities.

    e.g. The heroine is a senior TV executive.
           女主角是一名电视台的高级主管。

2. 女英雄;女杰;女豪杰
    A heroine is a woman who has done something brave, new, or good, and who is therefore greatly admired by a lot of people.

    e.g. The national heroine of the day was Xing Fen, winner of the first Gold medal of the Games.
           现今的民族英雄是在该运动会上获得首枚金牌的邢芬。

3. （女）偶像;心目中的女英雄
    If you describe a woman as your heroine, you mean that you admire her greatly, usually because of a particular quality or skill that she has.

heroine的近义词

    e.g. My heroine was Elizabeth Taylor.
           我心目中的偶像是伊丽莎白·泰勒。