Display Screen or Portion of a Device with Transitional Graphical User Interface

FIG. 1 is a front view in a first image of a display screen or portion of a device with transitional graphical user interface;

FIG. 2 is a front view in a second image thereof; and,

FIG. 3 is a front view in a third image thereof.

The appearance of the transitional image transitions between the images shown in FIGS. 1 - 3 . The process or period in which one image transitions to another image forms no part of the claimed deign.

The outer broken lines in FIGS. 1 - 3 show a display screen or portion of the device thereof, and form no part of the claimed design. Texts presented as broken lines in FIGS. 1 to 3 form no part of the claimed design.