Latin Numbers 1–10 with Roman Numerals
Number Latin Word Roman Numeral English Example
1 ūnus I unity, unique
2 duo II dual, duplicate
3 trēs III triple, triangle
4 quattuor IV quadrilateral,
quadruple
5 quīnque V quintet,
quintuplet
6 sex VI sextet, sextuple
7 septem VII September
(originally the
7th month)
8 octō VIII octagon, octave
9 novem IX November
(originally the
9th month),
novena
10 decem X decade, decimal
Extension: English Words Derived from Latin Numbers
• Unicorn — from ūnus (one) + cornu (horn): 'one-horned'.
• Duplicate — from duo (two): means to make a copy, or 'two of'.
• Tripod — from trēs (three) + pous (foot): 'three-footed stand'.
• Quadrant — from quattuor (four): a quarter of a circle.
• Decimal — from decem (ten): relating to ten or based on ten.
Optional extras: October, November, December all come from Latin
numbers octo (8), novem (9), and decem (10).
