Webster’s Revised Unabridged Dictionary · 1913
Arch
Arch (ärch), a. [See Arch-, pref.] 1. Chief; eminent; greatest; principal.
The most arch act of piteous massacre. Shak.
2. Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.
[He] spoke his request with so arch a leer. Tatler.
Arch, n. [See Arch-, pref.] A chief. [Obs.]
My worthy arch and patron comes to-night. Shak.