- 1) in such a way that something seems to be true
It looks as if it's going to rain.
Jack smiled as though he was enjoying a private joke.2) used when you are describing something and you imagine an explanation for it that you know is not the real one
The house was in such a mess – it looked as though a bomb had dropped on it.3) spoken used for emphasizing that something is not true or is not important
"Don't get lost or anything, will you?" "As if I would – I'm not stupid."
Why was he worrying about the interview? – As if it mattered anyway!
English dictionary. 2014.