Oxf. Adv Learn Dict says that neither also means: 'not one'. Is the sentence 'Alma has been on neither TV programmes so far' (meaning 'not in any') still incorrect contextually? The sentence should mean: Alma has not been in any TV programmes so far.

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not one or the other of TWO people or things

Also,

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not one nor the other of TWO things or people

Why have you started to doubt what you first seemed to understand and accept? :))

It is not incorrect

(But "on no TV programme" sounds better)

Please check the above link - from the very Oxf. Adv Learn Dict, which you yourself quoted. Here it is again:

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Check the explanation and the examples:

After neither and either you use a SINGULAR verb:

Neither CANDDATE was selected for the job.

Not the word "neither" is incorrect

but the word "programmes" (because it was

put into the plural)

Kedves Előző,

Akkor olvasd el az eredeti kérdést, hogy világos legyen, miről is van szó :)

http://www.gyakorikerdesek.hu/kozoktatas-tanfolyamok__nyelvt..