Definition of begin
1 : to do the first part of an action : go into the first part of a process : start began by introducing herself will have to begin again
2a : to come into existence : arise Their problems were just beginning.
b : to have a starting point Her career began in Chicago. Prices begin at $110 per night.
3 : to do or succeed in the least degree I can't begin to tell you how pleased I am.
1 : to set about the activity of : start They began the lecture at 10:00. have already begun construction
to begin with
: as the first thing to be considered
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