onto
prep.
1580s, as on to, from on + to. Appeared much later than parallel into. As a closed compound (on analogy of into), first recorded 1715.
| 词汇 | onto | 
| 词根词缀 | Online Etymology Dictionary onto prep. 1580s, as on to, from on + to. Appeared much later than parallel into. As a closed compound (on analogy of into), first recorded 1715. | 
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