The Oxford Thesaurus An A-Z Dictionary of Synonyms - maintenancen.

1) upkeep, care, preservation, conservation, support, sustention, sustentation: I can no longer afford the maintenance of a large country estate. 2) continuation, continuance, perpetuation, prolongation, persistence, maintaining: His maintenance of an untenable position will lose him votes. 3) upkeep, livelihood, subsistence, support, allowance, living, sustenance, stipend, subvention, contribution, alimony, keep: How much maintenance does he pay to his ex-wife and children?