rə̇ˈfreshə(r), rēˈf- noun
( -s )
Etymology: Middle English refressher, from refresshen to refresh + -er
1.
a. : something (as a drink) that refreshes or revives
stopped in the bar for a quick refresher
b. : something that makes fresh or vivid again : reminder
c. : something that provides review or additional instruction after a period of inactivity or gives instruction designed to keep one abreast of developments in scholarly investigation or new professional techniques and developments
for those who need a simple refresher on the basic science involved in atomic energy — Alfred Friendly
the serviceman is called to London for a refresher course whenever a new machine is marketed — Bryan Morgan
2.
a. Britain : an extra fee paid to counsel in a case adjourned from one term to another or unusually protracted
my retainer is reasonable, my refreshers modest — Hervey Allen
b. Australia : an extra fee paid counsel for each day of trial beyond the first five hours