Patent Publication Number: US-D809559-S

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

Description:
FIG. 1  is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design; 
         FIG. 2  is the second image thereof; 
         FIG. 3  is the third image thereof; 
         FIG. 4  is an enlarged view of a portion of  FIG. 1 ; 
         FIG. 5  is an enlarged view of a portion of  FIG. 2 ; and, 
         FIG. 6  is an enlarged view of a portion of  FIG. 3 . 
         FIGS. 4-6  are shown separately for clarity of illustration. 
       The outer perimeter illustrated by a pair of broken lines in  FIGS. 1-3  depicts a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines in  FIGS. 1-3  illustrate portions of the transitional graphical user interface that form no part of the claimed design. 
       The appearance of the transitional image sequentially transitions between the images shown in  FIGS. 1-3 . The process or period in which one image transitions to another image forms no part of the claimed design.