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CONTEXT. The Lambda Bootis stars are a small spectroscopic subgroup ofPopulation I A-type stars and show significant underabundances of metals. Manyare Delta Scuti pulsators.  AIMS. HD 210111 was selected for a detailed multisite pulsation study todetermine whether its pulsation properties differ from those of normal A stars.  METHODS. 262 hours of high-precision photometry were obtained at the SAAO andSSO observatories.  RESULTS. 13 statistically significant pulsation frequencies were detectedwith very small photometric amplitudes from 1 to 7 millimag in the visual. Acomparison with earlier 1994 measurements indicates a small increase inamplitude. As a byproduct, one of the comparison stars, HD 210571, wasdiscovered to be a millimag variable with a frequency of 1.235 c/d and isprobably a new Gamma Doradus variable. The observed wide range of excitedfrequencies from 12 to 30 c/d in HD 210111 can be explained with both thesingle- and double-star hypothesis. HD 210111 is in a similar evolutionarystatus to FG Vir, which also shows a wide range of excited frequencies with asimilar frequency spacing near 4 c/d. This is interpreted as successive radialorders of the excited nonradial modes. In the double-star hypothesis previouslyevoked for HD 210111, the low and the high frequencies originate in differentstars: here HD 210111 would resemble Theta^2 Tau.  CONCLUSIONS. The pulsation of the Lambda Bootis star HD 210111 does notdiffer from that of normal Delta Scuti stars.

Pulsation of the Lambda Bootis star HD 210111