To overlap (with), as in a schedule.
To be at odds (with); to disagree or be incompatible
A clash or disagreement, often violent, between two or more opposing groups or individuals.
An incompatibility, as of two things that cannot be simultaneously fulfilled.
The act of cooperating.
Association for mutual benefit, such as for purposes of production or purchase.
Active help from a person, organization, etc., such as an orderly sharing of space or resources.