One who comes to a place or organisation with which they have no previous connection with the sole or primary aim of personal gain, especially political or financial gain.
A migrant from the Northern to the Southern States after the American Civil War of 1861–5, especially one who went South to gain political influence.
A person who conforms to current opinions, especially for reasons of personal advantage; an opportunist.
A device, node or program that transmits the correct time to clients in a network.
Someone who performs a job for the required time only, making a minimum of effort.