One (disambiguation) - Definition and Overview

One can refer to several things:

• the number 1,
• the year 1 AD,
• a band,
• A British Train Operating Company and
• a line of pet food products called ONE.

One is also the title of various songs by:

• U2,
• Metallica, (see One (Metallica song))
• Marvin Hamlisch, in the musical A Chorus Line,
• Alanis Morissette,
• Harry Nilsson,
• The Bee Gees and
• Three Dog Night.