› [I or T] to create a company, organization, etc.: form a business/company/firm They joined together to form their own garment company.form a committee/agency/task force The council President formed the committee when the number of complaints jumped from around 50 per month to nearly 1,200. › [T] to develop a successful relationship with a person, organization, or country, especially for a particular purpose: form a coalition/partnership/alliance A regional Latino business coalition was formed to seek ways to fight the measures.