/ay"tee ith/ , adj.
1. next after the seventy-ninth; being the ordinal number for 80.
2. being one of 80 equal parts.
n.
3. an eightieth part, esp. of one ( 1 / 80 ).
4. the eightieth member of a series.
[ 1350-1400; ME eightetithe, OE ( hund ) eahtatigotha eightieth. See EIGHTY, -TH 2 ]