Most importantly.
In front, prominently forward.
First in time.
Positioned in front of (all) others in space, most forward.
Coming before (all) others in time.
Closest to the bow.
Of the highest rank or position; of the greatest importance; of the highest priority.
To a great extent or degree; highly; very.
Almost.
Forms the superlative of many adjectives.
The greater part of a group, especially a group of people.
A record-setting amount.
The greatest amount.
The greater part.