“egalitarian”

After reading the article “How to rise a feminist son” by Claire Miller I came to the sentences that says “Men who were raised by employed moms are significantly more egalitarian in their gender attitudes,” the word “egalitarian” popped up and I was of course curious to find out what it meant. At first I thought that it meant something to do with being fancy but turns out according to Merriam Webster it means ” asserting, promoting, or marked”. this was really weird and not what I aspected. I I can safely used this word without looking dumb in front of people.