Definition
To be formally obligated to work for a specific company or individual for a defined period, as specified in a contractual agreement.
（與公司或個人）簽訂合約
Most of the employees at this company are under contract with the firm for two years.
這家公司的大多數員工都與公司簽訂了兩年的合約。
Although he is still under contract, his performance has not met expectations.
雖然他仍在合約期內，但他的表現並未達到預期。
The artist is under contract with multiple galleries' agents.
這位藝術家與多家畫廊的代理商簽訂了合約。