Display screen or portion thereof with transitional graphical user interface

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

FIG. 2 is the second image thereof;

FIG. 3 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a second embodiment;

FIG. 4 is the second image thereof;

FIG. 5 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a third embodiment;

FIG. 6 is the second image thereof;

FIG. 7 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a fourth embodiment;

FIG. 8 is the second image thereof;

FIG. 9 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a fifth embodiment;

FIG. 10 is the second image thereof;

FIG. 11 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a sixth embodiment;

FIG. 12 is the second image thereof;

FIG. 13 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a seventh embodiment;

FIG. 14 is the second image thereof;

FIG. 15 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to an eighth embodiment;

FIG. 16 is the second image thereof;

FIG. 17 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a ninth embodiment;

FIG. 18 is the second image thereof;

FIG. 19 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a tenth embodiment;

FIG. 20 is the second image thereof;

FIG. 21 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to an eleventh embodiment;

FIG. 22 is the second image thereof;

FIG. 23 is a front view of the first image in a sequence of a display screen or portion thereof with transitional graphical user interface showing our new design according to a twelfth embodiment; and,

FIG. 24 is the second image thereof.

The dashed broken line perimeter in the figures illustrates a display screen or portion thereof and forms no part of the claimed design. The remaining dashed broken lines in the drawings illustrate portions of the graphical user interface that form no part of the claimed design.

The appearance of the graphical user interface sequentially transitions between the images shown in FIGS. 1 - 2 , 3 - 4 , 5 - 6 , 7 - 8 , 9 - 10 , 11 - 12 , 13 - 14 , 15 - 16 , 17 - 18 , 19 - 20 , 21 - 22 , and 23 - 24 , respectively. The process or period in which one image transitions to another image forms no part of the claimed design.