explorative
exploratory
advance
advanced
antecedent
anterior
arrangement
avant-garde
avant-propos
basic training
beginning
breakthrough
briefing
chief
clearing the decks
coming out
curtain raiser
debut
embarkation
embarkment
equipment
exordial
exordium
familiarization
first
first appearance
fixing
floating
flotation
foremost
forerunning
foreword
foundation
front matter
frontispiece
groundwork
headmost
inaugural
inaugural address
inauguration
induction
initial
initiation
initiatory
innovation
installation
installment
introduction
introductory
athletic competition
athletic contest
athletics
inception
origin
origination
above
basic
comprehensive
final
frequent
lengthy
previous
definitive