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Definitions of rigid:

adjective:   incapable of compromise or flexibility
adjective:   incapable of or resistant to bending
Example: "A rigid strip of metal"

adjective:   designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
adjective:   incapable of adapting or changing to meet circumstances
Example: "A rigid disciplinarian"

adjective:   fixed and unmoving
Example: "A face rigid with pain"

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Alternative Terms
unaltered orientation-geometry physics physical-body deformation distance point-geometry force quantum-mechanics molecule rotational-spectroscopy translation-geometry rotation reference-frame translation velocity acceleration angular-velocity orthogonal-matrix vehicle winding-number polygon rigid-body-dynamics center-of-mass axle hinge joint momentum-2 angular-momentum moment-of-inertia torque angular-acceleration precession newton-s-laws-of-motion kinetic-energy congruence improper-rotation chirality-mathematics mirror-image symmetry point-groups-in-three-dimensions through-and-through configuration-space manifold-3 euclidean-group antisymmetric euler-s-equations born-rigidity molecular-rotation statics dynamics mechanics rigid-body-mechanics permanent-axis exercise-and-sport-biomechanics nutation centrode-2 euler-equations-of-motion center-of-gravity body-cone euler-rodrigues-parameters

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