(mathematics) A positive integer that is the product of three distinct prime factors.

a small atmospheric particle, around which an ice crystal grows

plural of prime number

plural of number

Many individuals as a group.

Third-person singular simple present indicative form of number

Any of a range of European abbreviations for food additives used on labels. / (Britain, Ireland, informal) Any such additive, often regarded as undesirable.

(statistics) A hypothesis set up to be nullified or refuted in order to support an alternative hypothesis. When used, the null hypothesis is presumed true until statistical evidence in the form of a hypothesis test indicates otherwise. Therefore, the null and the alternative hypothesis must be mutually exclusive and exhaustive.

(idiomatic) First; foremost; best, often used after its headword.

The most important person, the one who is in charge. / Someone who is top of a ranking, who is ranked first. / Oneself, being considered foremost, as by an egoist.