SEMI
half, partly
UN
one
PRIM
first
SESQUI
one and one half times
DU
two
BI
two, twice
BIN
two, twice
SECOND
second, following
SECUND
second, following
TRI
3
TERTI
3rd
TERN
3 each
TER
3 times
QUADR(U)
4
QUART
4th
QUATERN
4 each
QUINQUE
5
QUINT
5th
QUIN
5 each
SEX
6
SEXT
6th
SEPT
7
SEPTEM
7
SEPTIM
7th