I looked up the synonyms for glide. remember folks, flying as we know it today did not have the terms we use today.
one of the synonyms for glide is: FLY
Synonyms are not words with the same meaning 100%.
The verb "to glide" is clearly explained in the dictionary
see: Glide - Definition and More from the Free Merriam-Webster Dictionary
and means "to fly without engine power", "to descend gradually in controlled flight"
Regarding the meaning of "glide" in 1904-1905, it was the same as today.
Talking about the Wright brothers, a certain Amos I. Root wrote in January 1905:
"I shall have to apologize a little, friends, for giving a picture of the gliding-machine instead of a flying-machine" (Source: NOVA | Wright Brothers' Flying Machine | The First Reporter | PBS ). Root made a clear distinction between gliding and flying.