Contention (noun)

1. A dispute or argument about something.
2. The act of competing for or striving for something.
3. The central point or argument in a discussion or debate.

Origin:

Middle english: from old french contention, from latin contentio(n-), from contendere 'strive, compete'.

Examples:

1. The contention between the two companies over the patent lasted for years.
2. The contention for the title was fierce.
3. The contention that the earth is flat is not supported by scientific evidence.
4. The contention in the debate was over the best solution to the problem.
5. The contention in the court case was over who was at fault for the accident.