[Adverb] Mainly or mostly. Example: Victims of this type of crime are predominantly young females, living in poorer areas.
Found on http://www.bbc.co.uk/skillswise/glossary/
predominance, predominant, predominantly 1. Greater or greatest importance, power, or influence. 2. The state of being the commonest or greatest in number or amount. Found on http://www.wordinfo.info/words/index/info/view_unit/1744/7