Try the following ...
For i = 1 to NoOfRows('yourtable')
LET varStatic = FieldValue('report_definition_name',$(i)); //Option 1: uses one variable to be used for actions within the loop
SET varName = 'var_$(i)';
LET $(varName) = FieldValue('report_definition_name',$(i)); //Option 2: creates variable for each value so they can be referenced outside of the loop
You will probably need to have distinct row values in the table. If you have a lot of values, the multiple variables option might not be a good idea.