I had a (little) hard time finding the word 宣材{せんざい}. It was neither in the
Midori dictionary nor Chrome's rikaikun extension. I had to google it.

I found an explanation here on
[kotobank](https://kotobank.jp/word/%E5%AE%A3%E6%9D%90-549947) but not much
more. My question is, is it a relatively new word? Or simply it is not
considered a "real word" but just a shortened form of 宣伝材料? Although in the
second case I would still expect it to pop up in a dictionary such as Midori
(maybe with a reference to 宣伝材料).
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question
words dictionary
Why the word 宣材 is not in the dictionary?
It's a common abbreviation in the marketing or showbiz field, but it's still
jargon, and simply not common enough to be listed in generic dictionaries. You
should be able to find this in a テレビ業界用語集, etc. It's also listed in [this
Wikipedia
article](https://ja.wikipedia.org/wiki/%E6%A5%AD%E7%95%8C%E7%94%A8%E8%AA%9E#%E8%8A%B8%E8%83%BD%E3%83%BB%E9%9F%B3%E6%A5%BD%E3%83%BB%E6%94%BE%E9%80%81%E3%83%BB%E5%86%99%E7%9C%9F%E3%83%BB%E5%A0%B1%E9%81%93)
along with many other words not in ordinary dictionaries. The meaning is easy
to guess, anyway.
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answer