(rare) The property of being seventeen.

The cardinal number occurring after sixteen and before eighteen, represented in Roman numerals as XVII and in Arabic numerals as 17.

plural of seventeen

The start of the eighteenth hour of the day on the 24-hour clock i.e. 17:00. / The number one thousand seven hundred. / The year 1700.

(US, colloquial) A girl's seventeenth birthday, or seventeenth-birthday party. It is often used to mitigate a failed sweet sixteen birthday.

plural of sweet seventeen

The periodical cicada.

plural of seventeen-year locust