Definition of aeger:
(n) :
(dated, British school slang) An excused absence from classes due to illness
(adj) :
(dated, British school slang) Absent and excused from one’s classes due to illness
(adj) :
(dated, British school slang) Relating to such an excused absence
(n) :
(dated, British school slang) A note excusing a student from classes due to illness
(n) :
(dated, local dialect) A particularly high tidal wave on some rivers, esp. the Trent