Lewis & Short

Zēno or Zēnon, ōnis, m., = Ζἠνων, the name of several Greek philosophers.

  1. I. The founder of the Stoic school, a native of Cittium in Cyprus; form Zeno, Varr. R. R. 2, 1, 3; Cic. Fin. 3, 2, 5; 3, 4, 15; id. N. D. 2, 22, 57; Sen. Ben. 4, 39, 1; Quint. 2, 20, 7; form Zenon, Cic. Tusc. 5, 9, 27 B. and K.; Sen. Ep. 33, 7.
  2. II. An Eleatic philosopher of Elea, in Magna Grœcia, Cic. Ac. 2, 42, 129; id. Tusc. 2, 22, 52; id. N. D. 3, 33, 82.
  3. III. An Epicurean philosopher, the teacher of Cicero and Atticus, Cic. Fin. 1, 5, 16; id. N. D. 1, 21, 59; 1, 33, 93 sq.; id. Tusc. 3, 17, 38.
  4. IV. A Greek emperor in the fifth Christian century.
    Hence, Zēnōnĭānus, a, um, adj., of or pertaining to the emperor Zeno, Zenonian: lex, Just. Inst. 3, 2, 3.