noun

1. An individual sheet of glass in a window.
2. (computing) A layer in the build-up of a GUI.

verb

1. (past of, perforate)

adjective

1. Pierced with holes.
   
2. Specifically, having a series of holes enabling easy tearing along a straight line.

noun

1. the act of perforating or the state of being perforated
2. any opening in a solid object

1. (medicine) an abnormal opening in an organ, such as a rupture
   1. a series of holes punched through something in order to assist in separating parts
2. (mathematics) that portion of a surface that remains after an open disk is removed from it

noun

1. (philately) A device for measuring the number of perforations per 2 centimetre distance along the edge of a postage stamp.

noun

1. stamp, Stamp collecting.
2. The study of postage stamps, postal routes, postal history, etc.

abbreviation (infl, en, abbreviation)

1. post office

noun

1. The charge for posting an item
2. The postage stamp, or similar token, affixed to an item of post as evidence of payment

adjective

1. Relating to the collection , sorting and delivery of mail.

noun (or post card)

1. a rectangular piece of thick paper or thin cardboard intended to be written on and mailed without an envelope.

noun

1. A marking made by a postal service on a letter, package, postcard or the like, usually indicating the place where and the date and time when the item was received or processed for the first time, and often serving to cancel a postage stamp.

verb

1. To apply a postmark on.

noun

1. a building, office or shop concerned with the business of delivering letters, post or mail and selling stamps etc
2. (UK) the organisation that delivers letters; The Royal Mail.

adjective

1. paid in advance (used especially of mail items)

abbreviation

1. (grammar): past participle

noun (abbreviated as Provo)

1. a member of the w:Provisional Irish Republican Army, Provisional Irish Republican Army