Does it really matter what you call it? All the disputes on the subject remind me of some dirty lawyer tricks. There's no court, no jury. The only reason of this question is trying to make a deal with your own conscience.
You may call it a lie, you may call it ommission, but in the end, it's all very simple: either you're honest or you're not. You can't be a little pregnant. Sorry to break it to you like that.