Game concept
Contribution
The game also links it as Contributions, Contribute, Contributed.
From the game's encyclopedia
Contributions allow multiple Rulers to assist in the development of a Great Project, gaining various benefits in return.
Some Contributions are mandatory for progress on the Great Project to start, while others are optional. Remaining optional Contributions can still be made while progress has started, up to certain point in time.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Contribution is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Contributions allow multiple Rulers to assist in the development of a Great Project, gaining various benefits in return." The game also links it as Contributions, Contribute and Contributed. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.