secern

verb

1. (archaic, literary, transitive)To separate or set apart (someone or something from other persons or things).

   “'[T]is not ſo much a local and bodily ſecerning our ſelves from evil men that God requires (as the Donatiſts falſely taught) but a ſpiritual ſeparation in mind and affections, and from their ſins, more than from their perſons.”

   “Often a prize would be awarded to some one dancer who had excelled his fellows. There were, I suppose, "born" Morris-dancers. Now and again one of them, flushed with triumph, would secern himself from his troupe, and would "star" round the country for his livelihood.”

2. (broadly, literary, transitive)To separate (something from other things) in the mind; to discriminate, to distinguish.
3. (archaic, literary, transitive)Synonym of secrete (“to extract or separate (a substance) from the blood, etc., for excretion or for the fulfilling of a physiological function”).

   “[T]he joint-glands themſelves grovv rigid, and ſecern leſs of their proper humour. Hence vvhen the gout falls upon people in years, it proves very ſevere, for vvant of a neceſſary quantity of that oleaginous matter to extinguiſh it.”

   “[T]he mimosa nilotica secerns from its roots a fluid as offensive as that of assafœtida; in the sap of its step an astringent acid; its glands give forth gum arabic; and its flowers an odour of a very grateful fragrance.”

4. (intransitive, literary)Of a person or thing: to become separated from others.
5. (intransitive, literary, rare)To secrete a substance.

   “[…] Birds bee commonly better Meat than Beaſts, becauſe their Fleſh doth aſſimilate more finely, and ſecerneth more ſubtilly.”