viscosity

a person's outward personality, character, disposition, appearance

certainty

(television, electronics) fidelity, the accuracy of signal reproduction

degree of difficulty

low class, low grade, low degree

(statistics) likelihood

the basics, a general idea

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