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onto

preposition (ADDING) (also on to)
 
 
/ˈɒn.tu/ US  /ˈɑːn.tu/

Definition

used about someone or something that is added to or joins a particular thing: Imir's been voted onto the union committee. I've been having problems loading this software onto my computer.Things added or attached to other thingsJoining and leaving groups and organizations
(Definition of onto preposition (ADDING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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