An Etymological Dictionary of Astronomy and Astrophysics

Math.: 1) Of or pertaining to a linear transformation from a vector space to itself that is not one-to-one.

2. Of or pertaining to a matrix having a determinant equal to zero.

Etymology (EN): M.E., from O.Fr. singuler “single, separate,” from L. singularis “single, solitary,” from singulus “one, individual, separate,” from sim- (stem of simplus) + diminutive suffix.

Etymology (PE): Takin, from tak “single, alone,” related to tâq “odd, single,”
tâ, tâh “piece, part; fold, plait, ply;” Mid.Pers. tak “single,” tâg, tâk, tâi “unit, piece, after numerals”

• -in adj. suffix.