1. The house or room appropriated to the keeping of business books, accounts, letters, and papers.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• countinghousse,
• continghouse,
• countinhouse,
• countinghous,
• countinghouse,
• counting house,
• xounting house,
• vounting house,
• founting house,
• dounting house,
• ciunting house,
• ckunting house,
• clunting house,
• cpunting house,
• c0unting house,
• c9unting house,
• coynting house,
• cohnting house,
• cojnting house,
• cointing house

The adjective form of "counting house" is "counting-house".

The plural of the "counting house" can be the "counting houses".

The singular of the "counting house" can be the "counting house".