already existing

to already exist

improvement, an action taken to improve / improvement, a spontaneous change for the better

(transitive) to improve, to make better / (intransitive) for something to improve on its own

betterment, improvement, amelioration

needed, necessary

need, necessity

system

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me