What is a tween... (asked by software engineer, not graphics/movie/illustrator)

Hi folks,
I am a software engineer, not a graphic artist, not an illustrator, not a Flash programmer... just to give you context for my question!
Could someone please explain to me what tween is or what it means? I'm not even sure how to ask my question. Is it a "tween graphic," a "tween animation" or what?
I have inherited some Java code that does graphic animation by sequentially displaying a series of PNG images one after the other. In that context, there are references to data structures called "tween".
Assume I am a rank beginner (not in Java but in graphics, motion video, illustration) and be as pedantic as your heart desires.
Many thanks in advance....

actually, in flash, a tween is used a few ways.
first, a tween can refer to the tween class. that class implements a variety of methods and properties that allow the appearance of smooth change in the property of an object. in its most abstract form, any property (that has getters/setters) of any object can use the tween class to (apparently) cause a continuous (but actually continual) change of that property.
2nd, it's an instance or a specific member of the tween class. so, when a specific object and a specific property (or in some tween classes, a specific set of properties) uses the tween class, a specific instance of the tween class is created.
and 3rd, because tweens are most commonly applied to graphic elements and change a property of the graphic element that has a visual representation resulting in a sequence of static images that when displayed rapidly give the impression of continuous (but again, is continual) change, that sequence of static images is often referred to as a tween.
it's the 3rd reference that is most commonly used. and most commonly movieclips are tweened so they apparently change position or color or rotation or some other visible property, smoothly. this reference could be (but it's not) applied to motion picture animation. what you see is a sequence of static images displayed rapidly (enough) to give the impression of continuous change.
and to address you specific comment, never have i heard of anyone referring to one element of a tween sequence as a tween. the entire sequence can be called a tween. but the first (or 2nd,..., or last) visual element of a tween would never be called a tween.

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