WordWeb Online

1. An organization of people (or countries) involved in a pact or treaty
   - alliance, alignment, alinement [non-standard]
    
2. The state of being combined into one body
   - fusion
    
3. The union of diverse things into one body, form or group; the growing together of parts
   - coalescence, coalescency, concretion, conglutination, concrescence

Derived forms: coalitions

Type of: conjugation, jointure, organisation [Brit], organization, unification, union, uniting

Encyclopedia: Coalition