When something becomes delineated, it means that it becomes clearly defined or outlined. There are several synonyms that can be used interchangeably with this phrase. One such synonym is 'outlined', which means to draw the outline or shape of something. Another synonym could be 'depicted', which means to show or represent something in a visual form. Additionally, 'defined' also works as a synonym, which means to give clarity or precision to something. Other synonyms for 'become delineated' include 'characterized', 'clarified', 'marked', 'demarcated', and 'described'. Ultimately, all of these words can be used to describe the process of something becoming clearly defined or outlined.