of or relating to the normal condition of the eye in which visual images are in clear focus on the retina; December 28, commemorating Herod''s slaughter of the children of Bethlehem
of a stage in the development of a language or literature between earlier and later stages; "Middle English is the English language from about 1100 to 1500"; "Middle Gaelic"; the ten Tribes of Israel that were deported into captivity in Assyria around 720 BC (leaving only the tribes of Judah and Benjamin)
concerned with work or important matters rather than play or trivialities; "a serious student of history"; "a serious attempt to learn to ski"; "gave me a serious look"; "a serious young man"; "are you serious or joking?"; "Don''t be so serious!"; (biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann