megayear n.

With what we have learned in the uncounted dusty megayears since, we might have been able to save him.

Now humans, the experts tell me, got started way back when, as ground apes that turned carnivore when the forests shrank up in Africa for lots of megayears.

I was born about ten megayears after the Singularity—the Extinction, Juan calls it.

Sam wants to go to Tau Ceti and build houses under the light of a new sun; the dark possibilities of five megayears hence couldn’t be of less interest to him.

Now let’s see if encephalization has changed during the last megayear.

I imagine that millennia, or megayears ago, when the face-to-face contactees got into their planet[-]killing disagreements, they didn’t much concern themselves with exactly which members of the other species had committed the unforgivable offense.