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.
A written or oral explanation of what constitutes the basis of an issue.
The act or process of introducing.
A means, such as a personal letter, of presenting one person to another.
An initial section of a book or article, which introduces the subject material.