həˈraɪzn n. 1 a
the line at
which the
earth and sky appear to meet. b (in full
apparent or
sensible or
visible horizon) the line at which the earth and sky
would appear to meet but
for irregularities and obstructions; a
circle where the earth's
surface touches a
cone whose vertex is at the observer's
eye. c (in full
celestial or
rational or
true horizon) a
great circle of the celestial
sphere, the plane of which passes
through the
centre of the earth and is
parallel to
that of the apparent horizon of a
place. 2
limit of
mental perception,
experience,
interest, etc. 3 a geological
stratum or set of
strata, or
layer of soil,
with particular characteristics. 4 Archaeol. the
level at which a particular set of
remains is found. øon the horizon (of an event)
just imminent or becoming apparent. [ME f. OF orizon(te) f. LL horizon -ontis f. Gk horizon (kuklos) limiting (circle)]