(1)主债务(→principal debt)

(2)主要义务
即主要合同义务，指基于当事人的主要缔约目的而产生的义务。例如，在买卖合同中卖方的主要义务是向买方转移标的物的所有权。

• vicarius
• vicarius apostolicus
• vicars choral
• vice
• vice-admiral
• vice-admiral of the coast
• vice-admiralty courts
• vice-chamberlain
• vice-chancellor
• vice-chancellor's court
• vice-comes
• Vice-comes dicitur quod vicem comitis suppleat.
• Vicecomes non misit breve.
• vice-comitissa
• vice-constable of England
• vice-consul
• vice crimes
• vice district
• vice-domini
• vice-dominus
• vice-dominus episcopi
• vice-judex
• vice-marshal
• vicem seu personam ecclesiae gerere
• Vice-Warden of the Stannaries