Patent Publication Number: US-D921649-S

Title: Display screen or portion thereof with transitional graphical user interface

Description:
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; 
         FIG. 2  is a front view of the second image thereof; and, 
         FIG. 3  is a front view of the third image thereof. 
       The appearance of the transitional graphical user interface sequentially transitions between the images shown in  FIGS. 1-3 . The process or period in which one image transitions to another forms no part of the claimed design. 
       The outer perimeter illustrated by a pair of dashed broken lines in  FIGS. 1-3  represents a display screen or portion thereof and forms no part of the claimed design. The gray scale in  FIG. 2  represents a different appearance then the solid black shown in the corresponding feature of  FIG. 3 . The remaining dashed broken lines shown in the drawings illustrate portions of the graphical user interface that form no part of the claimed design.