1) a song for several voices without musical accompaniment (madrigal)
2) without a companion; performed without an accompaniment (unaccompanied)
a substance added in small amounts for a particular purpose
added ingredient
(a group of people giving) support for opinions etc
support
(an example of) the condition when events happen at the same time as if this had been arranged
agreement; coexistence
a person who goes, or is often or always with, another
helper, friend
that which makes something complete; the full number or quality needed
companion, counterpart
a husband or wife of a ruler
associate, partner
a condition in which a person or thing is (in appearance, mind, health etc); an organized political community with a government; to express (an opinion etc) in words, especially carefully, fully and clearly
condition or mode of being