Noun

(en noun)

The upper portion of a page (or other) layout.

If you reduce the header of this document, the body will fit onto a single page.

Text, or other visual information, used to mark off a quantity of text, often titling]] or [[summarize, summarizing it.

Your header is too long; "Local Cannibals" will suffice.

Text, or other visual information, that goes at the top of a column of information in a table.

That column should have the header "payment status".

(informal) A font, text style, or typesetting used for any of the above.

Parts of speech belong in a level-three header . Level-two headers are reserved for the name of the language.

a brick that is laid sideways at the top of a wall or within the brickwork with the short side showing; compare stretcher

This wall has four header courses.

a horizontal structural or finish piece over an opening

a machine that cuts the heads off of grain etc

They fed the bale into the header .

(soccer) the act of hitting the ball with the head

His header for the goal followed a perfect corner kick.

*{{quote-news

, year=2011 , date=October 1 , author=Phil Dawkes , title=Sunderland 2 - 2 West Brom , work=BBC Sport citation , page= , passage=The Black Cats had a mountain to climb after James Morrison's header and Shane Long's neat side-foot finish gave Albion a 2-0 lead five minutes in.}}

a headlong fall or jump

''The clown tripped over the other clown and took a header .

(computing) the first part of a file or record that describes its contents

The header includes an index, an identifier, and a pointer to the next entry.

(networking) the first part of a packet, often containing its address and descriptors

The encapsulation layer adds an eight-byte header and a two-byte trailer to each packet.

A raised tank that supplies water at constant pressure, especially to a central heating and hot water system

A pipe which connects several smaller pipes.

Common practice is to use plastic pipes with iron headers .

Noun

(en noun)

A non-existent or empty value or set of values.

Zero]] quantity of [[expression, expressions; nothing.

(Francis Bacon)

Something that has no force or meaning.

(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.

(computing) the attribute of an entity that has no valid value.

Since no date of birth was entered for the patient, his age is null .

One of the beads in nulled work.

(statistics) null hypothesis