PRINCEPS
The following are the definitions of 'Princeps' from the authoritative
 Oxford Latin Dictionary (the first is the entry for the normal adjective,
the second is the entry for the noun substantive.  The Latin examples are not
given, but can be seen by clicking on the actual page jpg image at the bottom)

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princeps ~ipis, a [PRIMVS+-CEPS] FORMS: ~ipi (abl., cj.)  PL.Mos.237
     1  First in time, earliest.
     2  Taking the front position, leading, first.
     3  a First in numerical series.  b first in order of logical precedence, most necessary.
     4  Earliest existing, original.
     5  First in authority, dignity, or reputation, most distinguished, leading, chief.
         b  (of things) most notable or honourable, chief; ~eps locus, the chief position

princeps ~ipis, m., (f.).  [prec.]
     1  One who begins or originates, initiator, instigator, founder, proposer.
     2  One who is pre-eminent in a particular sphere, master, expert.
     3  A leading member, chief man  (of a group, state, class, etc.).
         b  (without gen.)  a leading citizen
     4  (as an official or complimentary title or applied to specific positions):
         a  ~eps senatus, and sim.,  The senator placed at the top of the list by the censors and
             ranked as the senior member.
         b  (w. ciuitatis); (pl., in Roman Republican politics) the body of consulares;
             (also ~ipes alone).
         c  ~eps iuuentutis, a title conferred on young members of the imperial family after
             Augustus' reorganization of the iuuentus.
         d  (of other posts).
     5  The person in charge, head; (also applied to animals) the leader (of a flock, etc.).
     6  (adopted by Augustus as a title to emphasize the non-military nature of his rule
        (cf. sense 3b), but later acquiring the connotation of an autocratic ruler).
     7  (mil.) a (pl.) One of the three classes of legionary soldiers, formed of men in the
         prime of life, employed as the second line in order of battle.
         b  (also ~eps primus) a centurion ranking second among the six centurions of a cohort;
             ~eps posterior, the fourth-ranking cneturion of a cohort.
         c  (designating mil. units; the precise meaning is not known).

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