technicality

noun3

1. •
   The quality or state of being technical.

   • Ha and Hyland suggest that technicality is not binary and it is not always possible to say that a word is technical or not. — 2018
2. •
   A minor detail, rule, law, etc., seemingly insignificant to a non-specialist but which has significant consequences in larger matters.
3. •
   That which is technical, or peculiar to any trade, profession, sect, or the like.

   • [T]he names of places and horses and slangy technicalities of the turf, had interlarded the poor girl's brain-sick babble; […] — 1862