1. any obstruction that impedes or is burdensome
Synonym: hindrancehinderancehitchpreventivepreventativeencumbranceinterference
2. an onerous or difficult concern
e.g. the burden of responsibility
that's a load off my mind
Synonym: burdenloadencumbranceonus
3. a charge against property (as a lien or mortgage)
Synonym: encumbrance