negotiation

difficult, lengthy, protracted

direct

successful

fruitless, unsuccessful

behind-the-scenes, secret

bilateral, multilateral

constant, continuous

delicate

detailed

serious

The two countries entered into serious negotiations to reach a peace agreement.

high-level

pay, peace, trade, wage, etc.

enter into, open

break off

resume

conduct

The two companies conducted negotiations over several weeks before reaching an agreement.

conclude

be open to, be subject to

Whether we can extend your contract remains subject to negotiation between both companies.

begin, start

continue, go on

The peace negotiations went on for several months before both sides reached an agreement.

break down, collapse

process

by ~

The two companies reached a settlement by negotiation rather than going to court.

in ~ (with)

The company is currently in negotiation with its employees about next year's salary increases.

through ~

The two countries decided to settle their trade dispute through negotiation rather than conflict.

under ~

The new trade agreement remains under negotiation between the two countries.

~ between

Peace talks finally succeeded after difficult negotiation between the government and the rebel groups.

~ of

The negotiation of a peace agreement between the two countries took several months.

~ on

The two companies held negotiations on the price of the contract last month.

~ over

The two countries held difficult negotiations over trade tariffs last month.

~ with

The company began negotiations with the union to reach a fair wage agreement.

a basis for negotiation, a matter for negotiation, months/years of negotiation

The two companies finally reached an agreement after months of negotiation.

a process of negotiation

Finding a solution to their disagreement required a long process of negotiation between the two companies.

room for negotiation

We still have some room for negotiation about the price before we sign the contract.