a battery

1. 1.

   the battery used to heat the filaments of a vacuum tube

   Broaderbattery

Questions about a battery

What does a battery mean?

a battery means "the battery used to heat the filaments of a vacuum tube".

Is a battery a common word?

a battery is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.