Definition Of why
(with reference to a reason) on account of which; for which.
the reason why flu shots need repeating every year is that the virus changes
a reason or explanation.
the whys and wherefores of these procedures need to be explained to students
expressing surprise or indignation.
Why, that's absurd!
for what reason or purpose.
why did he do it?
used to add emphasis to a response.
“You think so?” “Why, yes.”