principialis
From LSJ
Ζῆν οὐκ ἄξιος, ὅτῳ μηδὲ εἷς ἐστι χρηστὸς φίλος → Life is not worth living if you do not have at least one friend.
Latin > English (Lewis & Short)
princĭpĭālis: e, adj. principium,
I that is from the beginning, original (poet.): tempus, Lucr. 5, 246: levor, id. 2, 423.
Latin > French (Gaffiot 2016)
prīncĭpĭālis,¹⁵ e, primitif, originaire : Lucr. 2, 423 ; 5, 246.
Latin > German (Georges)
prīncipiālis, e (principium), anfänglich, ursprünglich, Lucr. 2, 423 u.a.