Xvii

Part of speech: noun

Definitions

1. The Roman numeral representing the number seventeen, written as a combination of letters from the Roman numeral system
2. A Roman numeral that stands for seventeen, often used for chapters, sequels, or the regnal numbers of rulers
3. The numeric symbol in Roman notation denoting the quantity seventeen, formed from a ten, a five and two ones

Etymology: The numeral "XVII" is built from Roman symbols in a simple additive pattern. Its value comes from "X" (ten) followed by "V" (five) and then two "I"s (one each): 10 + 5 + 1 + 1 = 17. The notation follows the standard Roman rule that a smaller symbol placed after a larger one is added, so the sequence reads left to right as a running sum. Roman numerals were used across Europe for centuries, and the letters themselves were ordinary Latin characters that Romans and their successors adapted for counting. The letter "V" for five is generally thought to derive from a notch or the shape of a hand, and "X" for ten from two crossed or doubled "V" marks, though these are explanations for the symbols rather than the numeral's history. The composite form "XVII" simply applies the same system used for all numbers from eleven to nineteen, where a ten-symbol is followed by smaller numerals.