Answer:

OMEGA

AnswerCrossword Clue
OMEGAThe end, in Athens
OMEGAAristotle's end?
OMEGAEnd of a series
OMEGAGreek letter
OMEGAPopular watch brand
OMEGA"The ... Man": Heston film
OMEGALast letter to Aristotle
OMEGAThe end
OMEGAAlpha's opposite
OMEGAGreek ending
OMEGAWatch word
OMEGAResistance figure
OMEGA...-3 fatty acid
OMEGARolex rival
OMEGAPsi follower
OMEGALast of a series
OMEGAAristotle's last letter
OMEGAIt's a long way from alpha
OMEGAGreek ending?
OMEGAClassical finale
OMEGAEnd
OMEGA..-3 fatty acid
OMEGALast in a Greek series
OMEGALast in a series
OMEGAHorseshoe-shaped letter
OMEGAWatch brand
OMEGASeries ender
OMEGA..-3 fatty acids
OMEGAGreek vowel
OMEGALast Greek letter
OMEGALast letter from Greece
OMEGALast of all
OMEGALast of Socrates?
OMEGASymbol for the first transfinite number
OMEGAOhm symbol
OMEGAOfficial Olympic timekeeper brand since 1932
OMEGAZee counterpart
OMEGAIt comes after psi
OMEGAPopular watch
OMEGAElectrical resistance symbol