header

1. 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.

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

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

3. 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".

4. 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.

5. 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.

6. The first part of a packet or stream, often containing its address and descriptors.

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

7. A brick that is laid sideways at the top of a wall or within the brickwork with the short side showing.

   This wall has four header courses.

8. A horizontal structural or finish piece over an opening.
9. A machine that separates and gathers the heads of grain etc.

   They fed the bale into the header.

10. The act of hitting the ball with the head.

    His header for the goal followed a perfect corner kick.

11. Someone who heads the ball.
12. A headlong fall or jump.

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

13. A raised tank that supplies water at constant pressure, especially to a central heating and hot water system.
14. A pipe which connects several smaller pipes.

    Common practice is to use plastic pipes with iron headers.

15. The rodeo performer who drives the steer toward the heeler to be tied.
16. One who puts a head on something.

verb

To strike (a ball) with one's head.

1. A file, usually in the form of source code, that is automatically included in another source file by the compiler.
2. A file that contains declarations but no implementations.