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I'm looking for a noun to describe the situation where something is changing width. Have a look at this hypothetical window frame:

Window frame with two panes of uneven height.

Window Frame with Two Panes of Uneven Height

The bottom part of the frame changes width across the window. What might I call the category of windows where this occurs?

I have thought about "widening," but am not overly fond of it, since it might go from wide to narrow, or you could even have a situation with more panes, where it is wide-narrow-wide. Any ideas?

  • width adjustment? – Boondoggle Jul 6 '18 at 8:07
  • I would be worried that could indicate I am doing something to adjust the width, whereas I am merely trying describe the situation where the width is not constant. – XerXes Jul 6 '18 at 8:12
  • "Stepped width"; broadly, "Stepped section"; of even just "stepped". – Kris Jul 6 '18 at 8:19
  • So s3.amazonaws.com/answer-board-image/… – Kris Jul 6 '18 at 8:20
  • They're windows of variable width or of varying width, depending on the sentence you want to use them in. I don't think you will find a single word for this. – terdon Jul 6 '18 at 8:22
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Window frames could be of uniform cross-section or rarely, with a change in width half-way.

Such an abrupt change in width is usually called a "step" and a member with its section having one or more such "steps" may be called a "stepped section".

For a visualization, consider the case of a "stepped beam" (Chegg via Google).

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