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Webster 1913 Edition

Noun.

The act of mingling.

(Paint.)

The method of laying on different tints so that they may mingle together while wet, and shade into each other insensibly.

Weale.

ppr.

Mingling together; confounding by mixture.

blending

present participle of blend
- 2013 May-June, William E. Conner, “An Acoustic Arms Race”, in American Scientist, volume 101, number 3, page 206-7:
  Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.

blending ‎(plural blendings)