Definitions
1.NounA person who conforms to current opinions, especially for reasons of personal advantage; an opportunist. .mw-parser-output .defdate{font-size:smaller}
2.NounSomeone who performs a job for the required time only, making a minimum of effort.
3.NounA device, node or program that transmits the correct time to clients in a network.
4.NounSomeone who honors their commitments only when it is personally easy to do so.