1. 营；军营
A battalion is a large group of soldiers that consists of three or more companies.

2. （尤指有组织、有特定任务、高效的）一大群，一大批
A battalion of people is a large group of them, especially a well-organized, efficient group that has a particular task to do.

1. an army unit usually consisting of a headquarters and three or more companies

2. a large indefinite number

e.g. a battalion of ants
a multitude of TV antennas
a plurality of religions

Synonym: large numbermultitudepluralitypack