One of the mysteries of the English language finally explained.
1The middle range of a series of years (of a person's age or of a century), temperatures, or monetary values numbered between thirteen and nineteen.
2Specifically. The middle of a person's teenage years.
Of or designating the mid-teens, especially the middle teenage years; (of a person) in the mid-teens.
1950s; earliest use found in The William and Mary Quarterly. From mid + teen.
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