Etymology

Verb

1. To join into a single mass or whole.

   The droplets coalesced into a puddle.

   • 2005, Plato, Sophist, Translation by Lesley Brown, 2,

     ... when a thing's own light and the light from something else coalescing into one on bright and smooth surfaces produce a form which yields a perception reversed from the way a thing normally looks.

2. To form from different pieces or elements.

   The puddle coalesced from the droplets as they ran together.