> four different, largely false-friends terms (as often canvassed on Language Networks, execution means signing of a Doc., Deed, Lease or Will) calling for 4 different posts.

Anyhow, finalis/zation (knocking into shape of the final contract) doesn't fit formalización if its is post-signing (execution).

Contract, conveyancing and mortgage completion IMO subsumes signing and exchange of contracts, payment of the price and hand-over of any keys to the property, so questionable in this context.

Alas, as already mentioned on ProZ, Her Late Britannic Majesty, even with the benefit of advice from Queen's Counsel who had gieb a written undertaking to 'proffer advice and conusel when called upon to do so', also confused contract completion with 'engrossment': 'I thought the Brexit Agreements had been finalised' (signed off or completed vs. fine-tuned).

Although this has come up before, formalising can mean putting into the right form, namely notaris/zation or by (non-US Land) Deed under (Notarial) Seal.

ejecución can mean (course of) performance as well as enforcement - depending on the context.


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Note added at 2 hrs (2024-02-18 22:02:02 GMT)
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.... Her Late Britannic Majesty, even with the benefit of advice from Queen's Counsel who had *given* a written undertaking to 'proffer advice and *counsel* when called upon to do so' ,,,,

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Note added at 7 days (2024-02-26 18:52:16 GMT) Post-grading
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You are welcome! In the UK, legalis/zing is a specific *authentication* process conducted at a foreign Embassy or Consulate of an already attested = notarially certified contract or translation - into or out of English - and that can be substituted by the simplified process of a notarial apostille 'in lieu' (Note the ProZ or TC non-favourite noun or gerundive of apostillis/zation or apostillis/zing -> as per a Brooke's Notary textbook footnote), for international recognition in foreign countries that are members of the 1961 Hague Convention Treaty.

The loose translation of formalización as 'finalis/zation', namely pre-completion knocking into final shape, IMO does not for once - as expounded - work in this instance post-signing, but m,ight have done pre-signing (or 'pre-execution').