To determine the meaning of 'Alibi':
1. The term 'Alibi' in legal context means a defense by an accused person claiming they were somewhere else at the time the crime was committed, thus incapable of being the perpetrator.
2. This plea requires evidence to prove the accused’s presence elsewhere.
3. The other options do not align with the specific defense mechanism of an alibi.
Therefore, the correct answer is (3) He was present elsewhere.