A witness who gives evidence which damages the case of the side which asked the witness to testify for them.

Someone who: watches a signature being put on a document, and then signs as well to verify the signature's authenticity; or attends court to testify about events they know about. To witness a document is to watch it being signed and then add your own signature and name, address and occupation.

A witness who: refuses to testify in support of the people who called them; or testifies in a way which differs from their previous statement.

An expert in a particular field who is called to give an opinion in a court case.

Evidence given in court of something said to the witness by another person.

A statement, by a witness, made under oath.

To sign to witness a signature on a document.

Extra pages to change a valid will which needs a minor alteration. The codicil must be signed and witnessed and then be attached to the will.

The evidence that a witness gives in court.

To question a witness for the other side in a case.

Doing something to interfere with the justice system (such as misleading the court or intimidating witnesses).