From WordNet (r) 3.0 (2006) [wn]:
Julian
adj 1: of or relating to or characteristic of Julius Caesar;
"the Julian calendar"
n 1: Roman Emperor and nephew of Constantine; he restored
paganism as the official religion of the Roman Empire and
destroyed Christian temples but his decision was reversed
after his death (331?-363) [syn: Julian, {Julian the
Apostate}, Flavius Claudius Julianus]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Julian \Jul"ian\ (?; 277) a. [L. Julianus, fr. Julius. Cf.
July, Gillian.]
Relating to, or derived from, Julius Caesar.
[1913 Webster]
Julian calendar, the calendar as adjusted by Julius Caesar,
in which the year was made to consist of 365 days, each
fourth year having 366 days.
Julian epoch, the epoch of the commencement of the Julian
calendar, or 46 b. c.
Julian period, a chronological period of 7,980 years,
combining the solar, lunar, and indiction cycles (28 x 19
x 15 = 7,980), being reckoned from the year 4713 B. C.,
when the first years of these several cycles would
coincide, so that if any year of the period be divided by
28, 19, or 15, the remainder will be the year of the
corresponding cycle. The Julian period was proposed by
Scaliger, to remove or avoid ambiguities in chronological
dates, and was so named because composed of Julian years.
Julian year, the year of 365 days, 6 hours, adopted in the
Julian calendar, and in use until superseded by the
Gregorian year, as established in the reformed or
Gregorian calendar.
[1913 Webster]