tech‧ni‧cal‧i‧ty plural technicalities [countable]
the small details of how to do something or how a system or process works
I don't really want to get into discussing the technicalities of laser printing.
a small detail in a law or a set of rules, especially one that forces you to make a decision that seems unfair:
The case against him had to be dropped because of a legal technicality.
on a technicality
The proposal was rejected on a technicality (=because of a technicality).