Real Dictionary

field
a series of observations, measurements, or facts; information [...]
an open tract of uncultivated grassland; meadow [...]
external or existing circumstances [...]
countable noun: A field is an area of grass, for example in a park or on a farm. A field is also an area of land on which a crop is grown.
countable noun: A field is an area of land or sea bed under which large amounts of a particular mineral have been found.
countable noun: A sports field is an area of grass where sports are played.