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Begin, commence, start, initiate, inaugurate, usher in mean to take the first step in a course, process, or operation. Begin, start, and commence are often interchangeable. Used with noun phrases if you start or begin something, you do it from a particular time.

We can use the verbs begin and start to mean the same thing but begin is more formal than start. Begin is an irregular verb. To begin to do something means to start doing it.

Jan 14, 2026begin (third-person singular simple present begins, present participle beginning, simple past began, past participle begun) (ergative) to start, to initiate or take the first step. When you begin something, you go ahead with its first part or stage — you can begin the day with a good attitude, or begin a very long book over and over again, always falling asleep before. See examples of begin used in a sentence.

Definition of begin verb in oxford advanced learner's dictionary. Master the word "begin" in english: