Good point. I think there are some sources where it is defined in a more rigorous manner, Chomsky and Herman's Manufacturing Consent book is one example I like

Good point. I think there are some sources where it is defined in a more rigorous manner, Chomsky and Herman's Manufacturing Consent book is one example I like. They tried as much as possible to document bias in reporting for similar instances in corporate controlled media in US. There are a series of well documented cases. In conversation, I agree, the term "bias" when it comes to news means "doesn't say things I like"