02/05/2019 4:21:00 02/05/2019 4:21:00 Defmean 02/05/2019 4:21:00 Frontline Frontline Frontline Share on What is Frontline?Frontline definition and meaning on Dictionary terms: nounfront(def 9).the visible forefront in any action, activity, or field: TV reporters are constantly involved in the front line of events. Football. front four. Basketball. front court(def 2b).