Wiktionary
first imperative
n. (context Latin grammar English) present imperative (qualifier: second-person forms only); compare (term: second imperative)
Usage examples of "first imperative".
However, it's equally true that the first imperative of evolution is diversity.
And this healing influence, distilled from the dark figure at his side, satisfied his first imperative need, so that he almost forgot to realise how strange and opportune it was that the man should be there at all.
The first imperative was to establish some real control over the griffin.