Any important word in a text or document, which may be linked to other words or other information, or at least merely listed in the metadata for searches to find.
A reserved word used to identify a specific command, function, etc.
Any word used as the key to a code.
Any word that occurs in a text more often than normal.
Any word used in a reference work to link to other words or other information.
To tag with keywords, as for example to facilitate searching.
Useful information, as opposed to noise.
A token; an indication; a foreshadowing; a sign.
A signalling interaction between cells
An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
Any variation of a quantity or change in an entity over time that conveys information upon detection.
An on-off light, semaphore, or other device used to give an indication to another person.
A simple interprocess communication used to notify a process or thread of an occurrence.
An action, change or process done to convey information and thus reduce uncertainty.
A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.
A sequence of states representing an encoded message in a communication channel.
Standing above others in rank, importance, or achievement.
To communicate with (a person or system) by a signal.
To indicate; to convey or communicate by a signal.