Definition of subinvariant in US English:

subinvariant

noun

Mathematics
  • A semi-invariant of a binary quantic of arbitrary or unspecified degree. Now historical.

adjective

Mathematics
  • Having the property of belonging to a finite series of subgroups each of which is a normal subgroup of the following subgroup, but not a normal subgroup of the group that is the last term of the series; designating a subgroup of such a series.

Origin

Late 19th century; earliest use found in James Joseph Sylvester (1814–1897), mathematician. From sub- + invariant.

Pronunciation

subinvariant

/ˌsʌbɪnˈvɛːrɪənt/