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.
*in limbo. 1  1. Lit. a region of the afterlife on the border of hell. (In some Christian religions, there is a limbo set aside for souls that do not go to either heaven or hell. 2  2. Fig. in a state of neglect; in a state of oblivion; in an indefinite state; on hold.