1. To be considered innately true, real, or correct; to be anticipated as always being available or at hand. The plenitude of our natural resources has been taken for granted by people for most of human history. I guess we had taken for granted that our kids would stick around this town and take care of us when we get older.

2. To be underestimated or undervalued; to not be properly appreciated or recognized. I've decided to go out and start my own business, because I'm sick of being taken for granted in this huge corporation.