2423. Other numerical adjectives are _multiplicatives_, ending in
#-plex#; they are: #simplex#, _onefold_, _simple_, #sēscuplex#, _one and
a half fold_, #duplex#, #triplex#, #quadruplex#, #quīncuplex#,
#septemplex#, #decemplex#, #centuplex#; and _proportionals_, used mostly
in the neuter as substantives: #duplus#, _twice as great_, #triplus#,
_three times as great_, #quadruplus#, #septuplus#, #octuplus#. Besides
these there are other adjectives derived from numerals: as, #prīmānus#,
_soldier of the first_: #prīmārius#, _first rate_: #bīmus#, _twinter_,
_two-year-old_; &c., &c.