attendant; member of an entourage
Refers to a person who accompanies someone, often in a formal or official capacity, such as a member of a retinue, party, or delegation.
I attended the meeting as a member of the president's entourage.
He was dispatched overseas as an attendant to the ambassador.
随行員 is similar but often used for members of an official traveling party, such as a diplomatic mission. 随伴者 can be used in broader contexts.
Compound of 随伴 (zuihan, 'accompanying') + 者 (sha, 'person'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of a person who accompanies another.