one person

next, order, sequence, below

a linear equation

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month

(literally) one side / everywhere, all around, the whole area / one viewpoint, one opinion or way of thinking / the front page of a newspaper

one day

next, secondary / following

number of times: an ordinal marker / number in a sequence, number of aspects or dimensions

(rare) order, sequence

(attached to nouns) the next, secondary, vice- / (chemistry) hypo- (used to distinguish the oxidation levels of various acids)