I never doubted their 'ultimate' success. [=I never doubted that they would eventually succeed]
They provide their customers with 'the ultimate in' service. [=with the best possible service]
The president has 'ultimate' [='final'] authority/control/responsibility over the decision.
(..) it gives me something. Some, you know, "I'm naked, but, you know..." I'd like to get pockets to hang off of the belt. That would be... Wouldn't that be the ultimate thing? To be naked and still be able to do this. I think that would really help a lot. A mental institution? (..)1991 TvShow: Seinfeld Title: The Truth Season: 3 Episode 2