mod 1
/mod/ , adj.
1. very modern; up-to-date; being in the vanguard in style, dress, etc.
2. ( sometimes cap. ) of or pertaining to a style of dress of the 1960s, typified by miniskirts, bell-bottom trousers, boots, and bright colors and patterns.
n.
3. a person who is in the vanguard in style, dress, etc.
4. ( sometimes cap. ) a British teenager of the 1960s who affected a very neat, sophisticated appearance and wore fancy clothing inspired by Edwardian dress.
[ 1955-60; shortened form of MODERN ]
mod 2
/mod/ , n. Informal.
modification.
[ by shortening ]