Webster's Revised Unabridged Dictionary · 1913

Plat

Plat , transitive verb

[See Plait.]

To form by interlaying interweaving; to braid; to plait.
They had platted a crown of thorns. — Matt. xxvii. 29

Plat , noun

Work done by platting or braiding; a plait.
Her hair, nor loose, nor tied in formal plat. — Shakespeare

Plat , noun

[Compare Plat flat, which perh. caused this spelling, and Plot a piece of ground.]

A small piece or plot of ground laid out with some design, or for a special use; usually, a portion of flat, even ground.
This flowery plat, the sweet recess of Eve. — Milton
I keep smooth plat of fruitful ground. — Tennyson

Plat , transitive verb

To lay out in plats or plots, as ground.

Plat , adjective

[French plat. See Plate, n.]

Plain; flat; level. [Obsolete] — Gower

Plat , adverb

1.
Plainly; flatly; downright. [Obsolete]
But, sir, ye lie, I tell you plat. — Rom. of R
2.
Flatly; smoothly; evenly. [Obsolete] — Drant

Plat , noun

1.
The flat or broad side of a sword. [Obsolete or Provincial English] — Chaucer
2.
A plot; a plan; a design; a diagram; a map; a chart. [Obsolete or Provincial English]
To note all the islands, and to set them down in plat. — Hakluyt