Batten v. t. : To make fat by plenteous feeding; to fatten.

Batten v. t. : To fertilize or enrich, as land.

Batten v. i. : To grow fat; to grow fat in ease and luxury; to glut one's self.

Batten n . : A strip of sawed stuff, or a scantling; as, (a) pl. (Com. & Arch.) Sawed timbers about 7 by 2 1/2 inches and not less than 6 feet long. Brande & C. (b) (Naut.) A strip of wood used in fastening the edges of a tarpaulin to the deck, also around masts to prevent chafing. (c) A long, thin strip used to strengthen a part, to cover a crack, etc.

Batten v. t. : To furnish or fasten with battens.

Batten v. t. : The movable bar of a loom, which strikes home or closes the threads of a woof.

Example:
Where can I find if it legal to carry a Batten in PA?

Taxonomy
batten, Roofing battens, roof, free encyclopedia, seams, Board and batten, batten seam, board & batten, roof tiles, panels, boards, seam roof, metal caps, search, free dictionary, construction material, fixing point, roofing sheet.

Defination from the web:
Batten trim, or batten molding, is a thin strip of trim, typically with a rectangular cross-section, used to cover seams between panels of ... In stagecraft, a batten or rail is a long pipe, usually metal, affixed to the ceiling or fly system in a theater. ...