treat
US /triːt/
UK /triːt/

1.
behave towards or deal with (someone or something) in a certain way
:
•
She treats everyone with respect.
•
The doctor treated his patient kindly.
2.
apply a process or a substance to (something) to protect or preserve it or to give it particular properties
:
•
The wood was treated with a special sealant.
•
The water needs to be treated before drinking.
1.
an event or item that is out of the ordinary and gives great pleasure
:
•
Going to the amusement park was a real treat.
•
She bought herself a little treat after a long week.