Witness

A person called upon by either side in a lawsuit to give testimony before the court or jury.

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Additional Sources

Answers.com

One who can give a firsthand account of something seen, heard, or experienced: a witness to the accident.

One who furnishes evidence.

One who is called on to testify before a court.

One who is called on to be present at a transaction in order to attest to what takes place.

One who signs one's name to a document for the purpose of attesting to its authenticity.

Duhaime Legal Dictionary

The legal definition refers to the court-supervised recital of that sensory experience, in writing but preferably in person and under oath.

FindLaw

To see the execution of (an instrument) and sign for the purpose of establishing authenticity.

Merriam Webster

One who testifies in a cause or before a judicial tribunal.

Wikipedia

A witness is someone who has firsthand knowledge about a crime or dramatic event through their senses (e.g. seeing, hearing, smelling, touching), and can help certify important considerations to the crime or event. A witness who has seen the event firsthand is known as an "eye-witness". Witnesses are often called before a court of law to testify in trials.