Definition of a specific kind of motion

[ShreddedHeart]

Homework Statement

It is not really a homework question, but rather a translation problem. I searched everywhere, but I still cannot find a good translation into English of a term that is defined as:

"In mechanics, the motion of a moving reference frame relative to another (primary) reference frame that is considered fixed".

Homework Equations

...the linear velocity V_kof particle k, due to such {"frame rotation/motion" ? the term I'm looking for }, is defined by formula

where

is a vector of the angular rate of rotation of the two-dimensional system relative to axis Z of the three-dimensional reference frame, e_z is a unit vector along axis Z, index i enumerates time moments of the two-dimensional world...

The Attempt at a Solution

(relative) frame motion / rotation

I'd be immensely thankful for any help!

 

[Jezza]

I would call that 'absolute motion.'