noun
plural -grounds
[count] the part of a scene or picture that is farthest from the viewer :the part of a scene that is behind a main figure or object in a painting, photograph, etc.
a surface or color that is behind or around something (such as a printed design)
[singular] a position that attracts little attention
b - used to describe something that occurs without requiring attention while something else is also occurring
c - used to describe something that is heard while something else is being listened to
[count] :the events and conditions that help to explain why something happens :the situation in which something occurs - usually singular
[noncount] :information needed to understand a problem or situation
[count] :the experiences, knowledge, education, etc., in a person's past