The author [S. M. Yusuf, Inverse semimodules, J. Natur. Sci. Math. 6 (1966) 111–117.] introduced inverse semimodules. In this paper, we introduce Clifford semimodules. The Clifford semimodules have been characterized here as a strong R-semilattice of R-modules. The congruences on inverse semimodules, specially, the R-module congruences, have been characterized here completely.