1. Canvass by distributing letters
   "The charity circularised potential donors to raise funds for the new hospital wing";
   - circularize
    
2. Distribute circulars to
   "The company circularised all its customers about the new product";
   - circularize
    
3. Cause to become widely known
   "circularise a rumour";
   - circulate, circularize, distribute, disseminate, propagate, broadcast, spread, diffuse, disperse, pass around
    
4. Make circular
   "They circularised the town square";
   - circularize
    
5. Canvass by using a questionnaire
   "The company circularised its customers to gather feedback on the new product";
   - circularize

Derived forms: circularised, circularises, circularising

Type of: air, alter, bare, canvass, change, modify, poll, publicise [Brit], publicize, send around