tab

1. A small flap or strip of material attached to something, for holding, manipulation, identification, opening etc.
2. An ear.
3. (by extension) A navigational widget, resembling a physical tab, for switching between documents or sets of controls.
4. The page or form associated with such a navigational widget.

   How many tabs are open in your Web browser?

5. (British army) A fast march or run with full kit.

verb

To affix with tabs; to label.

1. A restaurant bill.
2. Credit account, e.g., in a shop or bar; slate

   Put this round on my tab, will you, barman.

3. A space character that extends to the next aligned column, traditionally used for tabulation.

verb

To use the Tab key on a computer to advance the cursor or move the input focus, or on a typewriter to advance the carriage.

1. A cigarette.

   Giv'is a tab man!

noun

A form of musical notation indicating fingering rather than the pitch of notes, commonly used for stringed instruments.

noun

(British slang) A student of Cambridge University.

noun

A tabloid newspaper.

noun

A tablet, especially one containing illicit drugs.

noun

A tableau curtain.