What is "arcuation"

Arcuation \Arc`u*a"tion\, n. [L. arcuatio.]

1. The act of bending or curving; incurvation; the state of being bent; crookedness.
   --Coxe.

2. (Hort.) A mode of propagating trees by bending branches to the ground, and covering the small shoots with earth; layering.
   --Chambers.

n. 1 The act of bending or curving; the state of being bent; crookedness. 2 (context botany English) A method of propagate trees by bending branches to the ground and covering the small shoots with earth; layering.