primarily

1. (focus) Of a primary or central nature, first and foremost.Examples: "The idea of fitting a crane to an engine for shunting duties, primarily in works yards, appears to have originated with the North London Railway engine in 1872."; "But now a study has shown that most cancers are primarily caused by bad luck rather than poor lifestyle choices or defective DNA."; "Zika virus disease is caused by a virus transmitted primarily by Aedes mosquitoes, which bite during the day."Synonyms: by and large, chiefly, for the most part, mostly, above allfocusnot-comparable