What's the difference between 'start' and 'begin'?

Verb : start ; 3rd person present : starts ; past tense : started ; past participle : started ; gerund or present participle : starting

1.

Come into being ; begin or be reckoned from a particular point in time or space.

"the season starts in September"

synonyms : begin, commence, get underway, go ahead, get going ; More

informalkick off

"the meeting starts at 7 : 45"

BEGIN

begin ; 3rd person present : begins ; past tense : began ; gerund or present participle : beginning ; past participle : begun

1.

Start ; perform or undergo the first part of (an action or activity).

"theorists have just begun to address these complex questions"

synonyms : start, commence, set about, go about, embark on, launch into, get down to, take up ; More

initiate, set in motion, institute, inaugurate, get ahead with ;

informalget cracking on, get going on

"we began work"

come into being or have its starting point at a certain time or place.

"the ground campaign had begun".