frontier

the frontiers of physics

frontier towns; frontier law.

theories on the frontier of astrophysics.

the northern frontier was overrun by invaders.

fortifications that made the frontier inviolable.

a wide-open frontier town.

was hardened to life on the frontier;

the success of science in extending the frontiers of knowledge.

Sweden has frontiers with Norway and Finland.

They are highly interested in the frontiers of science.

The frontier station was starved for food and water.

an army grouping along the frontier

There were very few border controls on the southwestern frontier.

the passport opened frontiers to the traveller without let or hindrance.

Areas near the frontier were rough and lawless in the old days.

The frontier has worked him over inside.

Human acts have repercussions far beyond the frontiers of the human world.

But space isn't the only frontier.

It's called the production possibilities frontier, or PPF.

You know, we recently crossed the final frontier.

Change cannot be held back by frontiers.

And it's largely an unexplored frontier.

It had closed the frontier a year ago for what it said were security reasons.

It means expanding the frontiers of knowledge, your own, and then the world.

Africa could really be the next frontier for technology growth, he said.

But antislavery forces in the North want to keep the frontier free.

I would say that America is probably the last frontier for Indian cuisine.