A sveticism is a loanword or calque originating from the Swedish language.
Sveticisms are particularly found in the Finnish language, because the governing bureaucracy was mostly Swedish-speaking until the 20th century. The use of Swedish grammar constructions in official speech is a particularly persistent habit. The Swedish kommer att -future tense is an example, being translated to tulla + noun in illative case, e.g. talo tullaan rakentamaan < Swedish huset kommer att byggas "the house will be built". The language regulator recommends against the use of sveticisms such as this in official speech.
Sveticisms in English are loanwords, such as smörgåsbord and ombudsman.