rank (of troops); line; formation; array; procession
Refers to the orderly arrangement of soldiers or a military procession. Can be used for any disciplined line or formation.
The soldiers marched in formation.
Advance without breaking ranks.
Composed of 隊 (tai, 'squad, group') and 伍 (go, 'rank, file of five'). The combination refers to an orderly military formation.