someone who enlists workers to join a union
"The factory organiser successfully convinced all the assembly line workers to sign up for the new union in just three days."
a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.
"My old PDA used to be my only organiser, storing every appointment and contact number I needed while on the go."
Britain standard spelling of organizer.
"The local community centre needs a dedicated organiser to coordinate the upcoming summer festival."