In linguistics, and particularly in morphology, lemma refers to the canonical form of the word. This is important mainly in the highly flexible languages[?], such as Czech.
... (Italy) 1983 - Keke Rosberg, (Finland) 1984 - Alain Prost, (France) 1985 - Alain Prost, (France) 1986 - Alain Prost, (France) 1987 - Ayrton Senna, (Brazil) 1988 - ...