<p><strong>Adjective</strong></p><ul><li>logically connected; consistent: a coherent argument.</li><li>having a natural or due agreement of parts; harmonious: a coherent design.</li><li>cohering; sticking together: a coherent mass of sticky candies.</li><li>Physics, Optics. of or relating to waves that maintain a fixed phase relationship, as in coherent light, or light in which the electromagnetic waves maintain a fixed and predictable phase relationship with each other over a period of time.</li></ul>