1. A length (straight or curved) without breadth or thickness; the trace of a moving point.
2. A mark that is long relative to its width
3. A linear string of words expressing some idea
4. A formation of people or things one after another
5. A formation of people or things beside one another
6. Something long and thin and flexible.
7. A conceptual separation or demarcation:; SYN. dividing line, demarcation, contrast.
8. A fortified position (especially one marking the most forward position of troops)
9. A particular kind of product; SYN. product line, line of products, line of merchandise, business line, line of business.
10. A commercial organization serving as a common carrier.
11. Railroad track and roadbed; SYN. railway line, rail line.
12. In games or sports; a mark indicating positions or bounds of the playing area.
13. Acting in conformity; or or
14. A single frequency (or very narrow band) of radiation in a spectrum.

1. To mark with lines, draw lines on
2. To mark with lines
3. To fill plentifully
4. To cover the interior of, as of garments
5. To be in line with; form a line along; of trees along a river, etc.; SYN. run along.
6. To reinforce with fabric; of books.

1. Any wire or wires, such as power lines and telephone lines, used to transmit electrical power or signals.
2. In communications, a connection, usually a physical wire or other cable, between sending and receiving (or calling and called) devices, including telephones, computers, and terminals.
3. In a sonet network, a segment that runs between two multiplexers. See also sonet.
4. In word processing, a string of characters displayed or printed in a single horizontal row.
5. In programming, a statement (instruction) that occupies one line of the program. In this context, the common reference is to a “program line” or a “line of code.”