Letters that make all-time
a, e, l, m, t, i are letters that make 'all-time'
1 possible definitions for 'all-time'
Under this definition, all-time is an adjective and has the following properties:
incomparable, uncomparable are similar to 'all-time'.
"prices at an all-time high", "morale at an all-time low", "among the all-time great lefthanders"