You can say “fulfilled” if you prefer that word.
I prefer “superseded” in terms of Catholics today not being concerned with eating pork or wearing linsey-woolsey shirts or worrying about the ritual uncleanness of a woman’s menstrual periods.
In legal terms, when you get a new law, it supersedes the old law. The old law is no longer in force. The new law is. The new law may contain provisions that were copied over from the old law, or were somehow based on the old law but are expressed differently. Leviticus is a series of laws, therefore I think of its being superseded in a legal sense.
To me, this is a rather important point, because a lot of people who are not very smart about Christianity point to Leviticus and its laws that made sense at the time, but do not make much sense today, as an example of how the whole Bible and Christianity in general is out of whack and should not be followed. There’s also an unfortunate tendency for some Christians, including Catholics, to cherry-pick certain laws out of Leviticus and hold them up as example, while conveniently ignoring the many laws in there we don’t bother with any more. Therefore, it should be made very clear that Catholics do not go around following Leviticus. If there is something in Leviticus that is relevant for today, it is presented to us in a new form by the Magisterium.