1. 无人陪伴的；独自的
If someone is unaccompanied, they are alone.

2. （行李、货物等）单独运送的，不随主人同行的
Unaccompanied luggage or goods are being sent or transported separately from their owner.

3. 无伴奏的；清唱的；独奏的
An unaccompanied voice or instrument sings or plays alone, with no other instruments playing at the same time.

1. (of a state or an event) taking place without something specified occurring at the same time

e.g. a headache unaccompanied by other symptoms

2. being without an escort

3. playing or singing without accompaniment

e.g. the soloist sang unaccompanied