"impostor, cheat," mid-14c., from Anglo-French faiteor, faiture "evildoer; slothful person," apparently a specialized use of Old French faiture "sorcery, spell," literally "deed, action," from Latin facere "do, make, perform" (see factitious), an etymologically neutral term taken in a bad sense.
1. Stress, both human and mechanical, may also be a contributing factor.
2. Environmentalists say a critical factor in the city's pollution is its population.
3. This factor will come increasingly to the fore as election day nears.
4. Obesity is a major risk factor in many diseases.
5. A key factor in running a business is the delegation of responsibility.