A premise from which conclusions are drawn.
A floating reference point, or SLDMB, used to evaluate surface currents in a body of water. Often employed by coastal search and rescue.
A fixed reference point or set of reference points which precisely define a system of measurement or a coordinate system.
A fact known from direct observation.
To provide missing data points by using a mathematical model to extrapolate values that are outside the range of a measuring device.
Attestation of a fact or event; testimony.
One who sees or has personal knowledge of something.
Someone called to give evidence in a court.
One who is called upon to witness an event or action, such as a wedding or the signing of a document.
Something that serves as evidence; a sign or token.
To take as evidence.
To furnish proof of, to show.
To present personal religious testimony; to preach at (someone) or on behalf of.
To see the execution of (a legal instrument), and subscribe it for the purpose of establishing its authenticity.
To see or gain knowledge of through experience.