It is a noun.
Meaning : working order or alignment.It actually means proper form And good condition.It is mostly used along with off or out i.e. out of kilter,off kilter.
Synonyms: Balanced,in order,organized
Out of kilter means: awry, off balance,irreconcilable,disordered,in conflict, confused, disorganized, muddled,incompatible, conflicting, contrary, at odds, contradictory, inconsistent, incongruous, discordant, incoherent, out of step, at variance, discrepant
1)The hectic and frenzied pace of work puts me off kilter at the end of the week.
2)He put his desk in kilter.
3)The machine is in good kilter.
4)Her lifestyle was out of kilter with her new assignment.