what's the meaning of "spin-off" in this sentence

根据朗文:
1.a television programme involving characters that were previously in another programme or film
2.a separate and partly independent company that is formed from parts of an existing company, or the action of forming a company in this way
3.an unexpected but useful result of something, that happens in addition to the intended result
应该取义项2,"威斯康星州大学的分支公司子公司或分拆出的独立公司."
同时其他意义下可以指一个节目/电视剧/电影等衍生出来的姊妹篇;开发研究中得到的意外的作用(比如研究的新心脏病的药结果可以治疗糖尿病).