I personally dislike when people call polyamory "the lifestyle." That word is a euphemism for swinging, left over from the 1960s or 70s, to be all discreet about how you like to spouse swap or take part in casual group sex parties.
Polyamory does not need a euphemism, especially in this enlightened day and age. We don't call being pregnant "in the family way," or even use the term "expecting" much anymore. We can call sex "sex," not "marital intimacy" or some such term. We can call polyamory polyamory!
I'm probably more upfront and outspoken than many people, so I find this lifestyle term pretty annoying.