TECHNICALITY

n. technical detail, something that is technical; detail meaningful only to a specialist

The term legal technicality is a casual or colloquial phrase referring to a technical aspect of law. The phrase is not a term of art in the law; it has no exact meaning, nor does it have a legal definition. The words "legal technicality" are often used in a pejorative sense to denote technical aspects of law which result in a legal decision or verdict unfavorable to the party using the phrase.
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Noun
1. a detail that is considered insignificant
(synonym) trifle, triviality
(hypernym) detail, item, point

(n.)
The quality or state of being technical; technicalness.
  

(n.)
That which is technical, or peculiar to any trade, profession, sect, or the like.
  

Synonyms and related words:
a little thing, area, bag, complexity, complexness, complication, convolution, crabbedness, cup of tea, entanglement, field, forte, hardly anything, inessential, insignificancy, intricacy, intricateness, involution, involvement, jargon word, line, long suit, main interest, manner, marginal matter, matter of indifference, mere nothing, metier, minor matter, naught, nihility, no great matter, nothing, nothing in particular, nothing to signify, nullity, paltry affair, perplexity, pet subject, peu de chose, pursuit, ramification, rien du tout, scarcely anything, specialism, speciality, specialization, specialty, strong point, style, subtlety, tanglement, technical term, thing, thing of naught, type, vocation, way, weakness