1. A temporary alliance for combined action
   "The political parties formed a coalition"; "A coalition of unions organized the protest"
    
2. An organization of people (or countries) involved in a pact or treaty
   "The country joined a new economic coalition";
   - alliance, alignment, alinement [non-standard]
    
3. The union of diverse things into one body, form or group; the growing together of parts
   "Ice crystal coalition in clouds";
   - coalescence, coalescency, concretion, conglutination, concrescence

Derived forms: coalitions

Type of: conjugation, jointure [archaic], org [informal], organisation [Brit], organization, unification, union

Encyclopedia: Coalition