central
adjective
1. serving as an essential component
- the central cause of the problem
Similar word(s): important, cardinal, fundamental, key, primal
2. in or near a center or constituting a center; the inner area
- a central position
Similar word(s): amidship, bicentric, bifocal, center, halfway, middle, midway, centered, centric, centrical, focal, medial, median, middlemost, midmost, nuclear