By Anne Marie Helmenstine, Ph.D. Primary Standard Definition: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed. Primary standards are typically used in titrations and other analysis techniques as standardization solutions.rimary Standard Definition: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed.
fallo m (plural fallos) failure; verdict, decision; ruling; Verb . fallo. First-person singular present indicative form of fallar.
Definition of fall for Students. 1 : the act or an instance of going or coming down by the force of gravity a fall from a horse. 2 : autumn. 3 : a thing or quantity that falls a heavy fall of snow. 4 : a loss of greatness : downfall the fall of an empire. 5 : waterfall âusually used in pl.