President Clinton lied under oath to a grand jury. White House Rebuttal to charge 5. The law defines perjury very clearly.
Perjury requires proof that an individual knowingly made a false statement while under oath.
Answers to questions that are literally true are not perjury. Even if an answer doesn't directly answer the question asked, it is not perjury if it is true , no accused has an obligation to help his accuser. Answers to fundamentally ambiguous questions also can never be perjury. And nobody can be convicted of perjury based on only one other person's testimony. The President did not commit perjury .