convert

To transform or change (something) into another form, substance, state, or product.

A kettle converts water into steam.

1684-1690, Thomas Burnet, Sacred Theory of the Earth if the whole atmosphere were converted into water

To change (something) from one use, function, or purpose to another.

And the deff's further sayen that after the said b'gayn the said lambert compounded wt the said lychefeld ffor the moytie of the said Tymber stone glasse yren and tyle aforsaid by fforce whereof the said Lambert and Jane executrix of the testament of the said Thom's lychefeld haue broken and pulled down the stone walles & wyndoes of the said Churche dortr ffratr & cloyster & the same hath taken prceved & convertid to their p'per vses and behofe as lawfull was for the[m] to do by vertue of there said b'gayne & waraunt. All whiche mattrs the said def's ar redy to averre & p've as this hon'able cort shall award. And praye to be dysmyssed wt there resonable costs & charges for ther wrongfull vexac'on & trouble in this behalf.

He converted his garden into a tennis court.

To induce (someone) to adopt a particular religion, faith, ideology or belief (see also sense 12).

They converted her to Roman Catholicism on her deathbed.

No attempt was made to convert the Moslems.

To exchange for something of equal value.

We converted our pounds into euros.

To express (a quantity) in alternative units.

A person who has converted to a religion.

They were all converts to Islam.

While still in this relationship, Greene, a convert to Roman Catholicism at 23, was asked to be godfather to Catherine Walston, a 30-year-old married woman, at her own conversion.

A person who is now in favour of something that they previously opposed or disliked.

I never really liked broccoli before, but now that I've tasted it the way you cook it, I'm a convert!

Anyone who has converted from being one thing to being another.

A great advantage of these temporary conversions of a man into a beast is that it enables the convert in his animal shape to pay out his enemy without being suspected.

The equivalent of a conversion in rugby