Definition of onto preposition from the Oxford Advanced Learner's Dictionary

onto

preposition

/ˈɒntə/, before vowels

/ˈɒntu/

/ˈɑːntə/,

/ˈɑːntu/

(also on to)

used with verbs to express movement on or to a particular place or position
- Move the books onto the second shelf.
- She stepped down from the train onto the platform.
Definitions on the go

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used to show that something faces in a particular direction
- The window looked out onto the terrace.