In English, a contention can refer to a few different things, depending on the context. Here are some definitions from various sources:

• Cambridge English Dictionary: disagreement resulting from opposing arguments
• Merriam-Webster: a point advanced or maintained in a debate or argument
• Collins Dictionary: dispute in an argument
• Vocabulary.com: the act of competing as for profit or a prize; a contentious speech act; a dispute where ...
• Dictionary.com: a struggling together in opposition; strife; a striving in rivalry; competition; contest
• Oxford Advanced American Dictionary: angry disagreement between people; a belief or an opinion that you express, especially in an argument

In general, a contention can refer to a disagreement or dispute between people, often related to an argument or debate. It can also refer to a point or belief that someone is asserting in an argument. In some cases, it can refer to a competition or contest between people or groups.