one

.one may refer to:

• a file extension used by Microsoft OneNote
• .one, a top-level domain

The suffix -one is used in organic chemistry to form names of organic compounds containing the -C(=O)- group: see ketone. Sometimes a number between hyphens is inserted before it to state which atom the =O atom is attached to. This suffix was extracted from the word acetone. The final "-e" disappears if it is followed by another suffix that starts with a vowel.

1 (one; or , also called unit, unity, and (multiplicative) identity), is a number, a numeral, and the name of the glyph representing that number. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1.

, also known as or Nemoji or , was the childhood name of . She was the principal samurai wife of Toyotomi Hideyoshi. She is also known by the title of "Kita no mandokoro".

One, often stylized (ONe), was the debut and sole album released by the supergroup The Panic Channel, who formed in 2004, released via Capitol Records on August 15, 2006. There were two singles released: "Why Cry" and "Teahouse of the Spirits."

1 A.D. is a year.