Maximum, utmost. Obsolete.

Greatest, largest.

Of or relating to a maximum or maxima; that is a maximum; highest, greatest.

Of or constituting a maximum; of the greatest possible size, duration, or capacity.

Maximum (esp. as a written abbreviation). Also (more generally): very big, enormous.

Of a varying quantity, etc.: that has reached a peak (sense A. 7b); maximum, greatest; optimal, first-rate.

Of a person, thing, or its performance: stretched or challenged to the maximum degree; exerted or extended to the limit of capacity. Usually with out.