Display Screen or Portion Thereof with Transitional Graphical User Interface

FIG. 1 is a first image of a display screen or portion thereof with a transitional graphical user interface showing our new design according to a first embodiment;

FIG. 2 is a second image in a sequence thereof;

FIG. 3 is a third image in a sequence thereof;

FIG. 4 is a fourth image in a sequence thereof;

FIG. 5 is a fifth image in a sequence thereof;

FIG. 6 is a sixth image in a sequence thereof;

FIG. 7 is a seventh image in a sequence thereof;

FIG. 8 is a an eighth image in a sequence thereof;

FIG. 9 is a first image for a display screen or portion thereof with a transitional graphical user interface showing our new design in accordance to a second embodiment;

FIG. 10 is a second image in a sequence thereof;

FIG. 11 is a third image in a sequence thereof;

FIG. 12 is a fourth image in a sequence thereof;

FIG. 13 is a fifth image in a sequence thereof;

FIG. 14 is a sixth image in a sequence thereof;

FIG. 15 is a seventh image in a sequence thereof; and,

FIG. 16 is an eighth image in a sequence thereof.

The outermost broken lines in the figures show a display screen or portion thereof and form no part of the claimed design. The broken lines inside the transitional graphical user interface depict portions thereof that form no part of the claimed design. The appearance of the transitional graphical user interface sequentially transitions between the images shown in FIGS. 1 - 8 and 9 - 16 , respectively. The process or period in which one image changes from one image to another forms no part of the claimed design.