|Origin:||tidy 'at an appropriate time' (13-18 centuries), from tide|
ti‧dy1 comparative tidier, superlative tidiest especially British English
a room, house, desk etc that is tidy is neatly arranged with everything in the right place [= neat; ≠ untidy, messy]:
a tidy desk
I try to keep the garden tidy.
Ellen's room is always neat and tidy.
someone who is tidy keeps their house, clothes etc neat and clean:
Chris is a naturally tidy person.
a large amount of money:
We sold the house for a tidy sum and moved south.
4 British English
if someone has a tidy mind, the way they think is very organized and clear
—tidiness noun [uncountable]