The Court of Appeal has overturned a High Court finding that applicants for Irish citizenship must have "unbroken" residence here in the year before they apply.

The decision by the High Court came in the case of an Australian man who works in the university sector here, and had caused huge uncertainty in relation to citizenship applications.

Roderick Jones was refused citizenship by the Minister for Justice last year due to being out of the country for 100 days in the year before he applied. 97 of those days were spent on holiday and three were for work reasons.

A priority appeal was heard last month during which Mr Jones' lawyers and lawyers for Minister Charlie Flanagan both urged the Appeal Court  to overturn a High Court finding that the relevant law means citizenship applicants must have "unbroken" residence here in the year prior to their application.

Mr Justice Max Barrett had ruled last May the Minister's discretionary practice of allowing applicants six weeks out of the country, for holiday or other reasons, and more time in exceptional circumstances, is not permitted by section 15.1.C of the Irish Nationality and Citizenship Act 2015.

The Minister has no discretion in relation to the "continuous residence" requirement in that section, he ruled.  

Lawyers for Mr Jones and the Minister both argued the High Court erred in how it interpreted "continuous residence", but they disagreed on other aspects of the decision.

Sara Moorhead SC, for the Minister, argued that the residence finding should be quashed but Mr Flanagan's refusal of Mr Jones' application should otherwise be upheld and Mr Jones' his appeal dismissed.

The three judges ruled unanimously that the High Court had erred in how it constructed the relevant law and its construction is "unworkable", "overly literal", "unduly rigid" and gives rise to an "absurdity".

However Court of Appeal President, Mr Justice George Birmingham, sitting with Justice Máire Whelan and Justice Brian McGovern, dismissed the appeal.

Giving the judgment, Justice Whelan said Justice Barrett erred in law in how he interpreted continuous residence.

The court found the Minister's approach to Mr Jones' application was "reasonable" and mitigated the potential harshness of the first part of sub-section 15.

He had not adopted a rigid or inflexible policy in construing compliance with the relevant sub-section, she said.

She said it is in the public interest there is clarity so that someone like Mr Jones knows how he can meet the conditions.

The fact that most of Mr Jones' absences from the State were not work-related is "material", the Minister's policy did not amount to a fettering of discretion and is not unlawful.

Justice Whelan said in line with that policy, Mr Flanagan was correct in concluding Mr Jones did not have a period of residence as constituted "continuous residency".

The court dismissed the appeal for those and other reasons.