together
Individual
It Means Sociable!
Regarding "single" to be unmarried, the opposite is a married person, or spouse.
individual, part, unit, each
The opposite of troop would be Civilian or Individual.
The opposite sides of every individual rectangle are equal, but the opposite sides of one rectangle are not necessarily equal to those of another rectangle.
metaphase
The opposite of a guilty conscience is a clear conscience, where an individual feels free from any feelings of remorse or wrongdoing.
* unaccompanied * solo * a cappella * alone * solitary * single * individual
The opposite of a company (corporation, enterprise) could be a tradesman, who may have no business entity. The opposite of company meaning guests or accompaniment could be isolation, or solitude.
There isn't really an antonym for audience. There are many synonyms for it as well as phrases that mean the opposite, but not single words that mean the opposite.