0 an amount of money that is paid in one large amount on one occasion:
Her divorce settlement included a lump sum of $2 million.
1 a single payment of an amount rather than several payments of smaller amounts:
2 an amount of money that is paid in one large payment on one occasion:
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.