Display screen or portion thereof with transitional graphical user interface

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

FIG. 2 is a front view of a second image of the first embodiment thereof;

FIG. 3 is a front view of a third image of the first embodiment thereof;

FIG. 4 is a front view of a fourth image of the first embodiment thereof;

FIG. 5 is a front view of a fifth image of the first embodiment thereof;

FIG. 6 is a front view of a sixth image of the first embodiment thereof;

FIG. 7 is a front view of the first image of the first embodiment thereof shown in a manner of use;

FIG. 8 is a front view of the second image of the first embodiment thereof shown in the manner of use;

FIG. 9 is a front view of the third image of the first embodiment thereof shown in a manner of use;

FIG. 10 is a front view of the fourth image of the first embodiment thereof shown in a manner of use;

FIG. 11 is a front view of the fifth image of the first embodiment thereof shown in a manner of use;

FIG. 12 is a front view of the sixth image of the first embodiment thereof shown in a manner of use;

FIG. 13 is a front view of a first image of a second embodiment thereof;

FIG. 14 is a front view of a second image of the second embodiment thereof;

FIG. 15 is a front view of a third image of the second embodiment thereof;

FIG. 16 is a front view of a fourth image of the second embodiment thereof;

FIG. 17 is a front view of a fifth image of the second embodiment thereof;

FIG. 18 is a front view of a sixth image of the second embodiment thereof;

FIG. 19 is a front view of the first image of the second embodiment thereof shown in a manner of use;

FIG. 20 is a front view of the second image of the second embodiment thereof shown in a manner of use;

FIG. 21 is a front view of the third image of the second embodiment thereof shown in a manner of use;

FIG. 22 is a front view of the fourth image of the second embodiment thereof shown in a manner of use;

FIG. 23 is a front view of the fifth image of the second embodiment thereof shown in a manner of use;

FIG. 24 is a front view of the sixth image of the second embodiment thereof shown in a manner of use;

FIG. 25 is a front view of a first image of a fourth embodiment thereof;

FIG. 26 is a front view of a second image of the fourth embodiment thereof;

FIG. 27 is a front view of a third image of the fourth embodiment thereof;

FIG. 28 is a front view of a fourth image of the fourth embodiment thereof;

FIG. 29 is a front view of a fifth image of the fourth embodiment thereof;

FIG. 30 is a front view of a sixth image of the fourth embodiment thereof;

FIG. 31 is a front view of the first image of the fourth embodiment thereof shown in a manner of use;

FIG. 32 is a front view of the second image of the fourth embodiment thereof shown in a manner of use;

FIG. 33 is a front view of the third image of the fourth embodiment thereof shown in a manner of use;

FIG. 34 is a front view of the fourth image of the fourth embodiment thereof shown in a manner of use;

FIG. 35 is a front view of the fifth image of the fourth embodiment thereof shown in a manner of use; and,

FIG. 36 is a front view of the sixth image of the fourth embodiment thereof shown in a manner of use.

The rectangular broken line at the outer perimeter in all figures shows the display screen or portion thereof and the boundary of the claimed design, and forms no part of the claimed design.

The broken lines that are dashed showing landscape and mountain details in the interior of FIGS. 7-12, 19-24, and 31-36 form no part of the claimed design.

The appearance of the transitional images sequentially transition between the images shown in FIGS. 1 through 6 , between the images shown in FIGS. 7 through 12 , between the images shown in FIGS. 13 through 18 , between the images shown in FIGS. 19 through 24 , between the images shown in FIGS. 25 through 30 , and between the images shown in FIGS. 31 through 36 . The subject matter of this patent includes a process or period in which an image changes into another image. This process or period forms no part of the claimed design.