From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( v. t.) To form a plan of; to model; to lay out.

(2): ( n.) A plat; a plan; a sketch; a model; a pattern. Used also figuratively.

(3): ( v. t.) To place on a platform.

(4): ( n.) A place laid out after a model.

(5): ( n.) Any flat or horizontal surface; especially, one that is raised above some particular level, as a framework of timber or boards horizontally joined so as to form a roof, or a raised floor, or portion of a floor; a landing; a dais; a stage, for speakers, performers, or workmen; a standing place.

(6): ( n.) A declaration of the principles upon which a person, a sect, or a party proposes to stand; a declared policy or system; as, the Saybrook platform; a political platform.

(7): ( n.) A light deck, usually placed in a section of the hold or over the floor of the magazine. See Orlop.

King James Dictionary [2]

Plat'Form, n. plat, flat, form. The sketch of any thing horizontally delineated the ichnography.

1. A place laid out after any model. 2. In the military art, an elevation of earth or a floor of wood or stone, on which cannons are mounted to fire on an enemy. 3. In architecture, a row of beams or a piece of timber which supports the timber-work of a roof, and lying on the top of the wall.

This in New England is called the plate.

4. A kind of terrace or broad smooth open walk on the top of a building, as in the oriental houses. 5. In ships, the orlop. See Orlop. 6. Any number of planks or other materials forming a floor for any purpose. 7. A plan a scheme ground-work. 8. In some of the New England states, an ecclesiastical constitution, or a plan for the government of churches as the Cambridge or Saybrook platform.

Platic aspect, in astrology, a ray cast from one planet to another, not exactly, but within the orbit of its own light.