Definition of ha:

part of speech: interjection

Denoting surprise, joy, or grief; and, when repeated, laughter.

part of speech: verb

To express wonder, etc.; hesitate; as, to hem and ha.

part of speech: interjection

An expression of wonder, joy, hesitation, etc.

Usage examples for ha:

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A long narrow hall, or place for walking; the upper seats of a theater, church, assembly room, etc.; the occupants of such parts of a building; a building, or room, used for the exhibition of works of art, etc.; a covered passage in a work for defense or for communication; a balcony. ...