"Per incuriam" is a Latin phrase that literally means "through lack of care" or "through inadvertence.
" In legal terminology, a judicial decision (precedent) is said to have been given \textit{per incuriam} when the court that made the decision failed to consider a relevant and binding statutory provision or a binding court precedent that it was supposed to follow.
Because the decision was made in ignorance of a crucial binding authority, it is considered to be wrongly decided and does not have to be followed as a precedent by lower courts.