development, exploitation (of resources)

holding (a conference, exhibition, etc.)...

start, commencement, beginning...

opening (a door, window, etc.)...

to open (e.g. doors), to open (e.g. business, etc.)...

opening of a meeting

raising the curtain, opening (of an event), start...

opening to the public, making available to the public, exhibiting...

development, evolution, progression...

to open (e.g. one's robe), to bare (e.g. one's chest), to expose...

reopening, resumption, restarting

establishment, opening, setting up...

reclamation (e.g. of wasteland), cultivation, development...

opening a new shop, opening a shop (for the day)

counting ballots, tally (of votes)

opening, gap, dried and opened fish

release (of information, documents, etc.)...

outbreak of war, starting a war

break in the deadlock

uncivilized, uncivilised, primitive...

curtain raising, starting (e.g. play, concert)

flowering, blooming, blossoming...

opening (for that day's business; of a library, museum, cinema...

opening a business, opening a practice

opening (of a broadcasting station, post office, bureau...

opening a port (seaport, airport, etc.)...

opening (of a new road, railway, etc.)...

private, non-public, secret...

opening, aperture (e.g. camera), opening one's mouth...

opening a school