antepenultimate
gray
grey
halfway
in-between
junior
mediate
middle
moderate
next-to-last
penultimate
second-year
sophomore
subterminal
third-year
Charlie McCarthy
Hydromatic
act between
agent
amidships
ancilla
appliance
arbitrate
arbitrational
arbitrative
arbitrator
automatic transmission
average
banal
bargain
broker
center
central
cogwheel
coming between
common
connection
contact
contrivance
core
creature
deputy
device
differential
differential gear
dummy
dupe
entrepreneur
equatorial
equidistant
fair
fairish
freewheel
front
front man
gear
gear train
gearbox
gearing
gearshift
gearwheel
go between
go-between
going between
chemical
chemical substance
negociate
negotiate
talk terms
multiple
neutral
secondary
successive
upper
various
immediate