Lucifer is a word created by men ...
Well all words were created ... lucifer has a long history, as discussed elsewhere.
... and people in the past and today who use or used the word have completely different concepts on its meaning.
Absolutely.
As demonstrated elsewhere, 'lucifer' in Scripture, Latin for the Day Star, was understood to signify Jesus. It was a positive reference.
With the printing of the Bible
in English, and the emergence of popular folk-theology, Lucifer began to used as a name for the devil around the 14th century.
But only in English. In the European vernacular bibles, German, French, Spanish, the translations was that language equivalent of 'morning star'.
Dante picked up 'Lucifer' and used it interchangeably with 'Satan' in his
Divine Comedy – but this Lucifer/Satan is trapped in the lowest of the nine circles of hell, a realm of frozen in ice. He is portrayed as an enormous winged demon embedded in the ice, his flapping wings circulates the cold air and keeps the ice frozen, which in turn locks the demon and the worst of the worst sinners. This demon has three mouths, eternally chewing on the bodies of Cassius, Brutus and Judas.
Dante borrowed from Scripture, but he also introduced elements from various mythologies as well as his own imagination.
His influence should not be under-estimated – but it's far removed from Scripture.