1.NounAn advantage consisting in starting a competition or task earlier than might be expected; given (or taken), for example, prior to the beginning of a race.
"Fred gave his younger brother a five-minute head start in the Easter egg hunt.; I want to set off at dawn to get a head start over the competition.; a day and a half head start"
2.NounA factor conducive to superiority and success.
"His father's money gave him a head start in life."