Webster's Revised Unabridged Dictionary · 1913

Pat

Pat , transitive verb

[Compare German patschen, Prov. German patzen, to strike, tap.]

To strike gently with the fingers or hand; to stroke lightly; to tap; as, to pat a dog.
Gay pats my shoulder, and you vanish quite. — Pope

Pat , noun

1.
A light, quik blow or stroke with the fingers or hand; a tap.
2.
A small mass, as of butter, shaped by pats.
It looked like a tessellated work of pats of butter. — Dickens

Pat , adjective

[Compare pat a light blow, Dutch te pas convenient, pat, where pas is from French passer to pass.]

Exactly suitable; fit; convenient; timely.
Pat allusion. — Barrow

Pat , adverb

In a pat manner.
I foresaw then 't would come in pat hereafter. — Sterne