1. (a.) Left unplanted after plowing; uncultivated; resting; as, fallow farmland.

2. (a.) Pale red or pale yellow; as, a fallow deer or greyhound.

3. (n.) Plowed land.

4. (n.) Land that has lain a year or more untilled or unseeded; land plowed without being sowed for the season.

5. (n.) The plowing or tilling of land, without sowing it for a season; as, summer fallow, properly conducted, has ever been found a sure method of destroying weeds.

6. (n.) To plow, harrow, and break up, as land, without seeding, for the purpose of destroying weeds and insects, and rendering it mellow; as, it is profitable to fallow cold, strong, clayey land.