- The definition of a header is a person or thing that puts tops on something, or is information at the top of pages in a paper, or is slang for a headfirst fall.
- An example of a header is a tool that puts the tops on nails.
- An example of a header is the title and page number on the top of the pages in a report.
- An example of a header is falling headfirst down a ski slope.
header definition by Webster's New World
- a person or device that puts heads on pins, nails, rivets, etc.
- ☆ a machine that takes off the heads of grain and sends them up an inclined plane into a wagon
- a pipe, tube, etc. that brings together other pipes to direct the flow of a fluid through them, as in an exhaust system
- in word processing, a line or lines of text, typically consisting of the topic, date, page number, etc., printed at the top of each page of a document
- Informal a headlong fall or dive
- Carpentry a wooden beam, as in flooring, placed between two long beams with the ends of short beams resting against it
- Masonry a brick or building stone laid across the thickness of a wall so that a short end is exposed in the face of the wall
- Soccer a shot or pass made by hitting the ball with one's head, esp. with one's forehead
header definition by American Heritage Dictionary
- One that fits a head on an object.
- One that removes a head from an object, especially a machine that reaps the heads of grain and passes them into a wagon or receptacle.
- A pipe that serves as a central connection for two or more smaller pipes.
- A floor or roof beam placed between two long beams that supports the ends of the tailpieces.
- A brick or stone laid at a right angle to the face of a wall so that only its short end is showing. Also called bonder.
- Informal A headlong dive or fall.
- Sports A pass or shot made in soccer by heading the ball.
- Textual information, such as a title, date, or page number, positioned in the top margin of a page and usually repeated throughout a document.
- A raised tank or hopper that maintains a constant pressure or supply to a system, especially the small tank that supplies water to a central heating system.
header - Computer Definition
- The portion of a data block, cell, frame, or packet that precedes the text field or payload and provides information such as the source address and destination address. The header often includes synchronization bits that serve to synchronize the operations of the transmit and receive devices across the link. Certain data protocols also use fields in the header to identify the length of the text field and the type of data, to indicate the level of tolerance for delay or loss during network transit, and any optional headers that might follow. For example, an Internet Protocol (IP) header might indicate that a Transmission Control Protocol (TCP) header follows. See also block, cell, data format (illustration), frame, packet, payload, text field, and trailer.
- The user header includes user-definable information such as system access (password), organization or department ID, operator ID, terminal ID, database or application ID, destination address, message sequence number, date/time ID, and message priority.
(1) In a disk or tape file, a set of data that resides permanently at the beginning. It may be used for identification only (type of file, date of last update, etc.), or it may describe the structural layout of the contents, as is common with many document and database formats.
(2) In a document or report, common text printed at the top of every page.
(3) Any caption or description used as a headline.
(4) In communications and networking, a group of fields added to the beginning of the message or packet. The fields typically include source and destination addresses as well as data that describe the message content. See HTTP header, e-mail header and header file.