Etymology of the term and an initial clarification . Acquiescence comes from the Latin word acquiescentia which, in turn, comes from the verb aquiescere which means to rest or rest. Thus, originally the acquiescentia was related to the fact of resting or being still, but the word evolved and acquired a new definitive meaning, expressing the idea of agreeing with something or consenting. Thus, acquiescence is authorization, conformity, approval or consent.
The use of the term
In the first place, it must be indicated that it is a cultism, as it is not used in common language . In the following sentence: "my son left school before the end of classes with the teacher's acquiescence" the term acquiescence could be replaced by authorization, approval, permission or others, all of them more common and everyday.
Having someone's acquiescence implies obtaining permission from another person with some kind of authority . In the parliamentary sphere, the use of phrases such as "with the equiescence of the president of the chamber, I request to speak." Something similar could happen in the context of a trial, in which a lawyer requests the judge's consent for some purpose. Whoever requests acquiescence is requesting the assent of a person who holds authority.
Not having someone's acquiescence means, therefore, not having permission to do something. The word approval would be a synonym for acquiescence, but in both cases we would be dealing with cultured words that are rarely used in colloquial communication .
The use of cultisms
Cultured forms of language should be used in those contexts where it is appropriate to do so. In the legal field or in a very formal text it is pertinent to use the word acquiescence, but in ordinary situations it would be inappropriate, since it could be valued as a form of pedantry.
Most cultisms come from Greek or Latin. Although cultisms can be shocking in certain contexts, on many occasions cultisms have been integrated into common language. Proof of this are words such as curriculum vitae, campus, paradigm , philia or phobia.
The use of cultured words creates some confusion. If someone goes to the doctor because they have a headache, the doctor may use the word headache. The same is true of most of the terms used in medicine (otitis, dermatitis, plasma, epidemic, osteopathy, pericardium, or bulge).