uk us written abbreviation for hectare: a unit for measuring the area of something, equal to 10,000 square metres (Definition of ha from the Cambridge Business English Dictionary © Cambridge University Press) The meaning of HA is —used especially to express surprise, joy, or triumph. How to use ha in a sentence. Heroin Anonymous is a fellowship of men and women who share their experience, strength and hope with each other that they may solve their common problem and help others to recover from heroin addiction. The only requirement for membership is a desire to stop suffering from heroin addiction. The meaning of HA HA is —used to express amusement or derision. The hectare (/ ˈhɛktɛər, - tɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land. Browse and Find coins, comics, currency, art, luxury handbags, sports memorabilia, wine, historical items, books, real estate, and more at Heritage Auctions. Cardi B - AH HA Stream/Download: Order on CD: Subscribe for more official content from Cardi B: . Browse and Find coins, comics, currency, art, luxury handbags, sports memorabilia, wine, historical items, books, real estate, and more at Heritage Auctions. 🌟 COME TO OUR NYC LIVE SHOW! October 2, 2026 - Town Hall Tickets Available Now: 🎧 TUNE IN TO OUR PODCAST - New Episode Every Tuesday! YouTube. This disambiguation page lists articles associated with the title Ha. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.