We don't have a decisive answer on this question. The meaning is essentially that it will translate to the same word in French. Both “meaningfully” and “significantly” are used in different places, but we haven't had time to do an analysis of whether or not there's a notable difference in the meaning. I'm sorry we couldn't be more helpful.
Evidence of meeting #60 for Foreign Affairs and International Development in the 44th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was ukraine.
A recording is available from Parliament.