An occupation, or job, was a type of work that one could perform for money or other benefits.
Later that year, Spock's brain was surgically removed yet he remained alive. According to Doctor Leonard McCoy, it was the greatest technical job he had ever seen. Every nerve ending in the brain had been neatly sealed; nothing ripped nor torn, and no bleeding, which he considered a medical miracle. (TOS: "Spock's Brain")
In 2364, upon learning the definition of the term "private eye" from Jean-Luc Picard, Data deemed it to be a most interesting occupation. Picard replied that it probably wasn't really as interesting as literature made it out to be. (TNG: "Lonely Among Us")
Clare Raymond, L.Q. Clemonds, and Ralph Offenhouse's occupations were listed in their files on the SS Birdseye, the space module on which their cryogenically preserved bodies were stored. (TNG: "The Neutral Zone")
Seven of Nine told Chakotay that she was changing the parameters of their relationship, as they both had dangerous occupations, which she felt would make emotional attachments inadvisable. (VOY: "Endgame")