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How would you politely say that? When you talk to a stranger, and you don't
know the word he just said. Say f.e.: 落札 I understand that you could just say
「落札」の意味は何ですか？ but is there specifically a polite form of って ?

And to take it further, would there be even a Keigo version of って ?
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2015-09-24T11:31:54.347
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2015-09-24T12:30:49.780
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question
particles spoken-language keigo politeness
Polite form of って in 「なになに」って何？
って in your example is an informal version of と言う (other usages are explained
[here](https://kotobank.jp/word/%E3%81%A3%E3%81%A6-572021))

と言う is a general set phrase ( _something called something_ ) and does not
identify the speaker, but you can ask specifically for a word someone said in
a polite form replacing 言う with 仰る{おっしゃる}, for example
先ほどおっしゃった◯◯と言う言葉の意味は何ですか。
CC BY-SA 3.0
2015-09-24T12:26:37.050
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2015-09-24T12:26:37.050
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I would say

落札ってどういう意味？(casual)

落札ってどういう意味ですか？(polite)

落札とは、どういう意味でしょうか。(politer, formal)
CC BY-SA 3.0
2015-09-24T12:30:49.780
28241
2015-09-24T12:30:49.780
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answer