According to dictionary.com:

–noun
1. an act or instance of placing close together or side by side, esp. for comparison or contrast.
2. the state of being close together or side by side.
According to Buckeye Farm Girl:
–a state of being
1. when it’s 55 degrees and the pile of snow is still bigger than last year’s Christmas tree
2. when the lambs were outside all day but still huddle under the heat lamp in the barn
3. when birds are flying INTO the house (just how did it get in?) and pooping in the…bathroom