In front, prominently forward.
First in time.
Most importantly.
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.
Of two (or, rarely, more than two) things: the smaller in size (littler), in value, in importance etc.
a thing that is of smaller size, value, importance etc.