trilogy (n)
A group of three literary or musical works that have a related theme.
trisect (v)
To divide into three parts.
triumvirate (n)
A group of three, especially in authority.
quartus
(Latin)
fourth
Quatuor (Latin)
four
1. quadrant (n)
(Mathematics) A quarter of a circle or of its circumference.
2. Quadrant (n)
An early machine for measuring altitudes.
1. quartet (n)
a musical composed for four voices or instruments.
2. quartet (n)
A set of four, especially four musicians.
quatrain (n)
A stanza or group of four lines of poetry.
sex
six (Latin)
septem
seven
octo
eight
novem
nine
Decem (latin)
ten
1. decimate (v)
To destroy a large part of.
2. decimate (v)
to kill one in every ten.
decathlon (n)
an athletic contest in which each contestant takes part in ten events.
centum (latin)
hundred
1. bicentennial (n)
A two-hundredth anniversary.
2. bicentennial (adj)
Happening every 200 years.
1. centenary (adj)
Pertaining to a 100 year period.
2. centenary (n)
A centennial.
centigrade (adj)
referring to a thermometer scale of 100 degrees where water freezes at 0 degrees and boils at 100 degrees.