An ongoing relationship between (usually two) rivals who compete for superiority.
The characteristic of being a rivalrous good, such that it can be consumed or used by only one person at a time.
Any competition between two or more things or factors.
Exertion or contention for superiority, either by physical or intellectual means.
A trouble of any kind.
Striving; earnest endeavor; hard work.
Bitter conflict, sometimes violent.