noun

• (Greek mythology) Either of two heroes of the Trojan War.
• A town in Ontario, Canada
• (computing) A group of techniques for creating interactive Web applications, in which applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page.
• A ghost town in Utah
• An unincorporated community in South Dakota
• An unincorporated community in Natchitoches Parish, Louisiana.
• An unincorporated community in West Virginia
• The Amsterdam football club AFC Ajax
• (now rare, historical) A toilet.
• (poker slang) An ace and a jack as a starting hand in Texas hold 'em.
• (computing) Alternative form of Ajax [(Greek mythology) Either of two heroes of the Trojan War.]