So I searched the entire website for "nationalist aspirations" and it was only about the PLO:

Since that time it has declared itself the representative of the Palestinian people and their nationalist aspirations. https://www.adl.org/resources/glossary-terms/palestine-liberation-organization-plo

And this:

The British Mandate of Palestine lasted from 1923-1948, during which time the authorities were challenged by the demand by Zionists for Jewish self-government, and a growing Arab nationalist movement rejecting this Jewish presence and nationalist aspirations. https://www.adl.org/resources/glossary-terms/the-british-mandate