Ha interj. : An exclamation denoting surprise, joy, or grief. Both as uttered and as written, it expresses a great variety of emotions, determined by the tone or the context. When repeated, ha, ha, it is an expression of laughter, satisfaction, or triumph, sometimes of derisive laughter; or sometimes it is equivalent to "Well, it is so."

Example:
WHat was the initial molarity of the solution of Ha?

Taxonomy
a-ha, a ha, a-ha music, music, official community, concert info, a-ha albums, tickets, band biography, Biography and Photos, gallery, Foot of the Mountain, video, hunting high and low, music videos, on stage, dating, 1980's.

Defination from the web:
Official site of the Norwegian band includes videos, news, gallery, and more.