Display Screen or Portion Thereof with Transitional Graphical User Interface

1. Display screen or portion thereof with transitional graphical user interface

1 . 1 is a Front view of a first image in a sequence for a display screen or portion thereof with transitional graphical user interface; and

1 . 2 is a second image thereof.

The appearance of the transitional images pertains to a display screen for a symbol matching test.

The appearance of the transitional image sequentially transitions between the images shown in Figs. 1 - 2 . The process or period on which one image transitions to another image forms no part of the claimed design.

The outer perimeter shown in broken line in the drawings illustrates a display screen or portion thereof and forms no part of the claimed design. All other broken lines show portions of the graphical user interface that form no part of the claimed design.