(noun)
the development of similarities in two separate places or entities, through independent processes, especially in context of developing biological structures/features or development within cultures;
e.g. Bats and birds developed their wings by convergence, since they are not actually related.
(noun)
the process of distinct things merging or coordinating into a unified whole, especially in context of industries or technologies being combined or the images perceived by the two eyes being combined to form a full image;
e.g. These devices have fallen out of use due to convergence, since their functions have been integrated into other devices.