noun

the quality of being dedicated or committed to a task or purpose.

his dedication to his duties

commitment,wholeheartedness,single-mindedness,enthusiasm,zeal,application,diligence,industry,assiduity,resolve,resoluteness,purposefulness,conscientiousness,perseverance,persistence,tenacity,doggedness,drive,staying power,backbone,sedulousness,hard work,effort,labour,striving,devotion,devotedness,loyalty,faithfulness,adherence,allegiance,constancy,staunchness