Coherence (noun)

1. The quality of being logically or aesthetically ordered and consistent.
2. The quality of sticking together and cohering as a mass.
3. A property of waves that causes them to remain in phase with each other.
4. The property of light that causes it to travel in a straight line and prevents the spread of its energy into the surrounding space.

Origin:

From late latin cohaerentia, from latin cohaerere ("to stick together"), from co- ("together") + haerere ("to stick").

Examples:

1. The coherence of his argument was undeniable.
2. The coherence of the book is enhanced by the consistency of its tone.
3. The coherence of the group's ideas made for a strong plan.
4. The coherence of the laser beam is maintained by passing it through a resonator.
5. The coherence of the waves in the sea allowed for a successful surfing competition.