> as lemmas
tripair
tripair n.
Brit. 
/ˈtrʌɪpɛː/
, /ˈtrʌɪpɛː/U.S. /ˈtraɪˌpɛ(ə)r/
Mathematics a set of three pairs./ˈtraɪˌpɛ(ə)r/ΘΚΠ
the world > relative properties > number > mathematical number or quantity > numerical arrangement > [noun] > set > elements in or parts of > specific number of
hebdomad1545
quaternion1549
tetractys1603
quaternary number1605
tetrad1653
heptad1660
pentad1660
quaternary of numbers1809
tripair1878
trey1887
1878 A. Cayley Coll. Math. Papers X. 450 We have thus..a system of..63 hexpairs; and selecting at pleasure any three pairs out of the same hexpair, we have a system of (63 × 20 =) 1260 tripairs.
<
as lemmas