uni, sol, mono

one, singular

Spelled uni, sol, mono · unus 'one'; solus 'alone' (mono is from Greek monos 'single')

Latin unus, one, and solus, alone: a uniform has one form, unison makes one sound, and a solitary person stands alone.

Words built from it

uniform — the same throughout; consistent
uni (one) + form (shape)
unison — the state of acting or sounding together as one
uni (one) + son (sound, from sonus)
solitary — alone, without companions
sol (alone) + itary (relating to)
unify — to make into a single unit
uni (one) + fy (make, from facere)
desolate — left alone; deserted and bleak
de- (completely) + sol (alone) + -ate (made into)
monotonous — boringly repetitive and unvarying
mono (one) + ton (tone) + -ous (full of)

solar — from Latin solaris, from sol 'sun,' not solus 'alone'
solemn — from Latin sollemnis 'customary, annual,' related to sollus 'whole,' not to solus 'alone'
solution — from Latin solutio 'a loosening,' from solvere 'to loosen,' not solus 'alone'