A supporting base on a vessel, chair leg, etc. Also, a unit of distance measurement equal to a third of a yard, or to twelve inches. To convert feet into meters, multiply them by 0.3048. To convert square feet into square meters, multiply them by 0.0929; into square yards, divide them by 9. To convert cubic feet into cubic inches, multiply them by 1728.0; into gallons (US dry), x 6.42851; gallons (US liquid), x 7.48052. Abbreviated ft. or with a ' (inches can be abbreviated in. or with a ").