Patent Publication Number: US-D804493-S

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

Description:
FIG. 1  is a first image in a sequence for a display screen or portion thereof with a transitional graphical user interface showing our new design; 
         FIG. 2  is a second image thereof; 
         FIG. 3  is a third image thereof; 
         FIG. 4  is a fourth image thereof; 
         FIG. 5  is a fifth image thereof; 
         FIG. 6  is a sixth image thereof; and, 
         FIG. 7  is a seventh image thereof. 
       The broken lines showing a display screen or portion thereof, text, symbols, and portions of the graphical user interface illustrate portions of the article, and form no part of the claimed design. 
       The appearance of the graphical user interface transitions sequentially between the images shown in  FIGS. 1-7 . The process or period in which one image transitions to another forms no part of the claimed design.