I'm sometimes confused by notations from the dictionary. Simply put, I don't understand what it is trying to convey. Here is one example.
(also negotiations) Discussion aimed at reaching an agreement:
1. a worldwide ban is currently under negotiation
2. negotiations between unions and employers
3. It took five months of negotiations between the two parties to have the agreement in place.
How should I understand the notation "also negotiations"
Does it mean all the singular "negotiation"s in the above sentences are interchangeable with "negotiations" s and vice versa？To be specific, are these equally acceptable：
1a. a worldwide ban is currently under negotiations
2a. negotiation between unions and employers
3a. It took five months of negotiation between the two parties to have the agreement in place.