cen-.

Headword: 
cen-.
Principal English Translation: 

one, or the entire thing; this prefix is often added to measurements; with matl the n changes to m (cemmatl); before a p we also see cem- (e.g. cempopolli), just as we do before nouns that begin with a vowel (e.g. cemixcolli, cemacuahuitl)

Orthographic Variants: 
cem-