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Is it the word "between", but truncated, or a portmanteau of "in between" and "teen"?

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If it means tweenager then it's a truncation of a portmanteau word. – Andrew Leach Jul 29 '13 at 6:31
Tween is also a word used in computer animation. Here is a definition from About.com: "Tween" is actually short for "in-between", and refers to the creation of successive frames of animation between key frames. animation.about.com/od/glossaryofterms/g/tween_def.htm – Shoe Jul 29 '13 at 9:35
@AndrewLeach, Isn't "a truncation of a portmanteau word" also considered a portmanteau? – Pacerier Jun 21 '15 at 17:23
Holy thread resurrection, Batman! @Pacerier: if one can be more precise about how a particular portmanteau word is formed, why not be? – Andrew Leach Jun 21 '15 at 17:48
up vote 5 down vote accepted

Here's Merriam-Webster's definition of portmanteau:

word or morpheme whose form and meaning are derived from a blending of two or more distinct forms (as smog from smoke and fog)

Here's The Free Dictionary's definition of tween:

A child between middle childhood and adolesence, usually between 8 and 12 years old. [Blend of teen and between.]

The OED says tween is short for tween-age, after teen. For tween-age, they say it's an alteration of teenage after 'tween (a form of between).

So, yes, tween can be considered a portmanteau of "[in] between" and "teen".

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