  CONTEXT. The Lambda Bootis stars are a small spectroscopic subgroup of
Population I A-type stars and show significant underabundances of metals. Many
are Delta Scuti pulsators.
  AIMS. HD 210111 was selected for a detailed multisite pulsation study to
determine whether its pulsation properties differ from those of normal A stars.
  METHODS. 262 hours of high-precision photometry were obtained at the SAAO and
SSO observatories.
  RESULTS. 13 statistically significant pulsation frequencies were detected
with very small photometric amplitudes from 1 to 7 millimag in the visual. A
comparison with earlier 1994 measurements indicates a small increase in
amplitude. As a byproduct, one of the comparison stars, HD 210571, was
discovered to be a millimag variable with a frequency of 1.235 c/d and is
probably a new Gamma Doradus variable. The observed wide range of excited
frequencies from 12 to 30 c/d in HD 210111 can be explained with both the
single- and double-star hypothesis. HD 210111 is in a similar evolutionary
status to FG Vir, which also shows a wide range of excited frequencies with a
similar frequency spacing near 4 c/d. This is interpreted as successive radial
orders of the excited nonradial modes. In the double-star hypothesis previously
evoked for HD 210111, the low and the high frequencies originate in different
stars: here HD 210111 would resemble Theta^2 Tau.
  CONCLUSIONS. The pulsation of the Lambda Bootis star HD 210111 does not
differ from that of normal Delta Scuti stars.
