Later on every idea will be a heptad, made up of seven elements.

They didn't like to form anything larger than a heptad, though.

Indeed, the heptad of things finite is in all cases reducible to the pentad.

They hadn't planned, though, for the last-minute addition of the heptad from the Swarm.

In one of them they found Aïda, the only other survivor from the heptad.

In a sense we have our own heptad now.

The other Martians were busy shoving their hoarded supplies through the port into the heptad.

We're going to make room for them and for their heptad full of scarce vitamins.

Steve said, "One of the people who is definitely in that heptad is Spencer Grindstaff."

We think we could do it with a bolo consisting of a heptad and a triad, Katherine said.

Here in this heptad we have rapidly assembled a social hub for advocacy of concerns relevant to the AC.

The heptad and the triad?

So I talk to them-inperson here on our little heptad, or through the channels you mentioned, the Spacebook and the Scape.

Colours may best be expressed by a heptad, the largest possible formula for things finite, as the pentad is the smallest possible form.

So the plan had been for three spacewalkers to greet the heptad and lash it into place with cables as soon as it arrived.

If we jettison mass and pack all we have into a heptad, we can make the rendezvous around the time of your next apogee.