What does "OP" mean?

I've seen a lot of people trying to say that OP champions can still be beaten. but the word OP. to me means that a certain champion. is better than the average rest of the champions in the respective role. there is a reason certain champions get banned more than others. because they are either. easier to use. or are just playing out do this other champs do better. to me. the easiest champs to say are op are bust based champs. mages and assassins. it really depends on how much damage they do. for example. you got leblanc. which can kill 2-3 people under the turret with one burst and one item. yet she still get buffed? i mean her tether is pretty insane now. or yasuo. gets statik shiv and hes 0/3 then he goes 15/3. or illaoi. goes 0/7 straight up feeding in lane. comes a team fight. she 100 to 0s. all your team in one combo. or fiora that just rapes you in lane from level 1-6 just up the ass damage. or the 12% vayne that kills tanks in a handful of shots. whether you consider these champs OP or not. is up to you. but you have to considder the numbers. i mean i rarely get a fiora in a match. or a good vayne like literallt RARE. yasuo well hes in every match he doesn't have to be good he just overloaded. so is illaoi. you get near her your dead.

this game has balance issues. not all champions are as viable as others. which is to be expected with such a large pool. but riot can do a better job with these patches. I mean you buff an already. in my opinion. a god tier mage which is. leblanc. then your done fucked it up.

i mean i don't get any of these champions often at all. but other champions need love to. I mean viktors ultimate does 120% AP damage total and its an AOE DoT attack. while you have ekkos ult that does AOE on hit damage with 130% scale and it heals him. i don't see any balance there. am not asking for all champs to be the same but make some things more useful in some situations than others.