In Maths :- " Kiss is the shortest distance
between 2 Lips "
___________________________
In Biology :- " Kiss is just exchange of germs
from 1 mouth to another"
______________________________
In Chemistry :- " Kiss is a process of testing the
ph of the lips "
______________________________
In Physics :- " It's a process of charging a
human body "
___________________________
In Computer :- " Kiss is a local area network in
which 2 bodies are connected without a data
cable "
____________________________
In Economics :- " Kiss is a process in which
Demand is higher than Supply
In English:- kiss is a doing word or action word
WHICH SUBJECT DEFINED IT BEST.?

It's not among d options.

Define it romantically and it will give the perfect meaning.