Meeting or conference?

What is  the difference between the terms meeting, conference and convention? Thank you. Carol

A meeting is for a small group of people, anything from two upwards.
A conference is like a convegno (a series of lectures and meetings over the course of one or several days), but you can also have a press conference, if you wish to make an announcement to the media. In Britain there is also a “party conference”: this is the annual gathering of a political party (Labour, Conservative etc.) during which its delegates meet and discuss policy, elect leaders etc. In the United States the Republican and Democrat parties have a convention every four years: here they choose their presidential and vice-presidential candidates.
Also, in more general terms, the Americans tend to say “convention” for “convegno,” whereas the British tend to say “conference.”