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ilmoittaa
(transitive) To add a name to the list of people who are participating in something.
määrätä
(transitive) To add a name to the list of people who are participating in something.
ilmoittautua
(intransitive) To add one's own name to the list of people who are participating in something (including amateur, but not professional, teams).
tilata
(intransitive) To agree to purchase some good or service.