parametrical Definition

parameter
noun

1. math.
A constant or variable that, when altered, affects the form of a mathematical expression in which it appears.
2. physics.
A quantity which under a particular set of conditions remains constant, but may be altered if the conditions change.
3. A limiting factor that serves to define the scope of a task, project, discussion, etc

Example: What parameters are we working within?
Thesaurus: limit, boundary, restriction, framework, guideline, specification, criterion.
Form: parameters (often)

Derivative: parametric
adj

Etymology: 17c: from Latin parametrum, from Greek para- alongside + metron measure.