He is celebrating his seventy-oneth birthday today.

She ate seventy-oneth of the cake.

She wrote a beautiful sevenling for her poetry class.

Seventeenthly, I would like to address the issue of climate change.

The seventeen-year locust emerges from the ground in large numbers.

Seventysomethings are enjoying their retirement.

I am a Seventh-day Adventist.

Seventh-day Adventists believe in the second coming of Jesus Christ.

Seventy translators were involved in the translation of the Septuagint.

He ate one seventh of the cake.