Answer:

lemma

Answer	Crossword Clue
LEMMA	Theoretical premise
LEMMA	Auxiliary theorem
LEMMA	Helping theorem

LEMMA	Auxiliary proposition
LEMMA	Preliminary proposition
LEMMA	Theme of a composition
LEMMA	Assumption for the sake of argument
LEMMA	Helpful theorem
LEMMA	Logical proposition
LEMMA	Logic proposition
LEMMA	Secondary theorem

LEMMA	Proposition in logic
LEMMA	Supporting premise
LEMMA	Subsidiary math theorem
LEMMA	Math proposition
LEMMA	Subsidiary proposition in a proof
LEMMA	Premise of a syllogism.
LEMMA	Secondary proposition, in logic.
LEMMA	Glossed word

LEMMA	Preliminary theorem
LEMMA	Glossary entry
LEMMA	Auxiliary proposition, in logic
LEMMA	Proposition in proving a theorem
LEMMA	Proposition for proving a theorem
LEMMA	Composition theme
LEMMA	Headword
LEMMA	Auxiliary proposition, in math

LEMMA	Proof part, sometimes
LEMMA	Subsidiary proposition
LEMMA	Basic form of a word
LEMMA	Helpful theorem, in math
LEMMA	Subject indicated in a heading
LEMMA	Mathematical stepping stone
LEMMA	Formal assumption
LEMMA	Proven proposition, in math

LEMMA	Subsidiary theorem
LEMMA	Mathematical proposition
LEMMA	Little theorem within a bigger theorem