Display Screen or Portion Thereof with Transitional Graphical User Interface

FIG. 1 is a front view of a display screen or portion thereof with transitional graphical user interface showing a first image in a sequence according to the present invention;

FIG. 2 is a front view of the display screen or portion thereof with transitional graphical user interface showing a second image in the sequence;

FIG. 3 is a front view of the display screen or portion thereof with transitional graphical user interface showing a third image in the sequence;

FIG. 4 is a front view of the display screen or portion thereof with transitional graphical user interface showing a fourth image in the sequence;

FIG. 5 is a front view of the display screen or portion thereof with transitional graphical user interface showing a fifth image in the sequence;

FIG. 6 is a front view of the display screen or portion thereof with transitional graphical user interface showing a sixth image in the sequence;

FIG. 7 is a front view of the display screen or portion thereof with transitional graphical user interface showing a seventh image in the sequence; and,

FIG. 8 is a front of the display screen or portion thereof with transitional graphical user interface showing an eighth image in the sequence.

The appearance of the graphical user interface sequentially transitions between the images shown in FIGS. 1 - 8 . The process or period in which an image transitions to another image forms no part of the claimed design.

The perimeter broken-line box forming a frame around the transitional graphical user interface illustrates a display screen or a portion thereof and forms no part of the claimed design. The other broken lines illustrate portions of the graphical user interface and form no part of the claimed design.