Centuria (Century) 10 Conturbenia - 80 men

A century or centuria was made up of ten Contubernium - the essential fighting unit - which was led by a centurion.

A deputy centurion was called a Optio.

Each centry had its own Signifier (standard bearer).
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(The plural of centuris is centuriae)

Cohort - (6 centuries = 480 men)

There were six centuriae (centuries) with a total of 480 fighting men (not including officers) in a cohort. The cohort was the basic fighting unit.

A centurion led each century in a cohort and a Primus pilus (a senior centurion) commanded the cohort.

Each centuria had a Signum as a standard.

Contubernium (8 men) > Centuria (80 men) > Cohort (480 men) > Legio (5,000 men)