She looked forward to our union with placid contentment, not unmingled with a little fear, which past misfortunes had impressed, that what now appeared certain and tangible happiness might soon dissipate into an airy dream and leave no trace but deep and everlasting regret.
There are no more uses of "tangible" in the book.
Show samples from other sources
They set tangible goals.
The performance goal should be expressed as a tangible, measurable objective, against which actual achievement can be compared.