When one feels like it!!
A dunny is a lavatory, particularly one situated outside.
The boy's lavatory had three urinals and two toilet stalls.The girl's lavatory had five toilet stalls, but girls do not use urinals.A pipe burst, flooding the lavatory floor with hot water.
the lavatory call system of aircraft is a system in which any passenger using aircraft lavatory is in need of any help from any cabin crew may ask help by pressing a call button inside the lavatory and draw attention of cabin crew that some one is needing help in one of the lavatories.
During the middle of class, she asked the teacher to use the lavatory.
no bathroom
Lavatories
Reports range from 11-16 families shared the one lavatory next to the McCourt dwelling.
a toilet seat
no
lavatory
See the link below
restroomlavatory means bathroom or toilet