From Latin globus ('ball, sphere'), global initially meant 'spherical' in English before evolving to mean 'worldwide' and then 'comprehensive' over three centuries.
Relating to or encompassing the whole world; comprehensive, total, applying to an entire system or category.
From Latin globus ('a ball, a sphere, a mass gathered into a round body'), with the English adjective suffix -al. French globe entered English in the sixteenth century, and the adjective 'global' followed in the early seventeenth century, initially meaning 'spherical.' The shift from 'shaped like a globe' to 'pertaining to the entire world' happened gradually, as 'globe' itself became synonymous with the Earth
When 'global' first appeared in English around 1670, it simply meant 'shaped like a ball.' The world-spanning sense did not dominate until the twentieth century, driven by two world wars and the rise of international economics. Marshall McLuhan's 'global village' in 1962 helped cement the modern meaning.