There are three definitions of poverty in Daniel Dorlings recent book 'injustice'.
Definitiion 1 (Academic):
A person will have two of the following:
a) Feel poor
b) Unable to participate socially due to inadequate resources
c) Insufficient money to live
Definition 2 (US):
A person has below $x per day in income
Definition 3 (Europe):
A person has below the x percentile of population income.
I watched a surprisingly good TV programme with an architect (Kevin Mcleod) living in a slum in Mumbai. Many of the people living there would pass test 1), but fail 2) and 3).
1/5 of people in UK fail test 1)