if nothing else (`leastwise' is informal and `leastways' is colloquial)
"at least he survived"
"they felt--at any rate Jim felt--relieved though still wary"
"the influence of economists--or at any rate of economics--is far-reaching"
not less than
"at least two hours studying the manual"
"a tumor at least as big as an orange"
At the least; at a minimum or lower limit.