Excuse me, but you seem to be mixing to appear 'correct'.
Again, you seem to have been diluted by the other individual, there are more than ONE afternoon prayer.
Al-Salawati owns or governs Al-Salati Al-Wusta, Afternoon Prayers are a collective of Salawat.
In addition, Al Wusta has a Definite Article attached thus rendering the meaning ALL INCLUSIVE, NON EXCLUSIVE denoting EVERY meaning is relevant to the word 'Wusta', no meaning is excluded.
Definite Article , used to give the meaning of ?Most, All, Complete, Maximum, Whole, and to denote comprehensiveness, all aspects or categories of a subject, or to denote perfection and includes all degrees and grades.
Likewise, We made you a balanced nation / ommatan wasatan / , that you be a witnesses over people, and the Messenger be a witness over yourselves
wasatan is a verbal noun NOT an adjective, nor a definite noun(?), Al-Wusta is a different word
'middle nation'?
Peace
Mixing??? What do you mean?
There is no afternoon prayer. Afternoon in arabic is asr and there is no prayer in asr.
Then you say afternoon prayers are a collective of salawat. I don't believe that you yourself believe that. Definite article or not it still is singular genetive. Ask any arabspeaking true arab.
Wusta and wasat is the same word but in different forms. Its like seal and sealed. Or a kill and killed. Same ground meaning.
Peace