proposal-n; 3 Senses

Sense Number 1: a plan, scheme, suggestion

Commentary: PROPOSAL[+document][+plan][+thesis/+design/+business]
NOTE: can be singular or plural
NOTE: usually refers to a tangible plan, such as a document

They are reviewing a set of proposals for a new high-speed rail system.
John submitted his thesis proposal to his advisor on Friday.

PropBank: proposal.01
WordNet 3.0 Sense Numbers: 1

Sense Number 2: marriage offer

Commentary: PROPOSAL[+action][+speech][+offer][+marriage] marriage proposal, proposal of marriage - an offer of marriage
NOTE: a specialized narrow sense of Sense 3

She waited six years for his proposal.
His proposal was posted on the billboard at the stadium.

PropBank: NM
WordNet 3.0 Sense Numbers: 2

Sense Number 3: the act of making a suggestion or offering a plan

Commentary: PROPOSAL[+event][+action][+speech][+suggestion] the act of making a proposal
NOTE: always occurs in the singular
NOTE: implies a specific time and place of speaking

They listened to her proposal.
Her proposal was two hours long.
His proposal during the meeting yesterday was met with resistance.

PropBank: NM
WordNet 3.0 Sense Numbers: 3