Milliogender is a multigender, that is a subset of mathgender, in which one feels as though they have, experience, or encompass a million genders. It is similar to billiogender, centilliogender, kilogender, platilligender, trilligender, and zilliogender. It may also be considered a subset to pangender.
History
Milliogender was coined on July 31, 2018 by tumblr user arco-pluris.