Cohesion (noun)

1. The action or fact of forming a united whole.
2. The sticking together of particles of the same substance.
3. The force that holds together atoms or molecules in a solid or liquid.

Origin:

From middle french cohesioun, from latin cohaesus, past participle of cohaerere ('to stick together'), from co- + haerere ('to stick').

Examples:

1. The cohesion of the team was evident in their coordinated effort to win the game.
2. The cohesion of the soil particles allowed for good water retention.
3. The cohesion between the water molecules caused the surface tension of the pond.