The term 'at the center' can be represented by four different crossword solutions: FOCAL (5 letters), AMID (4 letters), MID (3 letters), and FOCALLY (7 letters). FOCAL is an adjective meaning 'central or most important, ' while AMID is a preposition meaning 'in the middle of.' MID is an adjective meaning 'in the middle, ' and focally is an adverb meaning 'in a central or FOCAL manner.' All four words refer to something being in the center, either literally or figuratively.