adjective “mid-century”
 base form mid-century, midcentury, non-gradable
- relating to or characteristic of the middle of a century, especially the 20th century 
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 The house is decorated in a mid-century modern style.
 
noun “mid-century”
 singular mid-century, midcentury, plural mid-centuries, midcenturies
- the middle of a century, especially the 20th century 
Many technological innovations emerged in the mid-century, transforming daily life.