Meet monday v Meet on Monday

So, would you meet today? Or, would you meet ON today? Also, would you have met yesterday, or ON yesterday?

meet on Monday
meet Monday

Both of these are acceptable. In the second case, "Monday" is an adverb like "today" or "tomorrow".

meet + noun
or
meet + noun phrase
is common

We will meet next week
They met yesterday.
She meets my needs.

BUT

We will meet on the 14th
Shall we meet at 2?
We met in 1998

HOWEVER

We will meet in February
AND
We will meet next February
NEVER
We will meet February

So with proper names such as months and days of the week, use the preposition

Perhaps in an effort to make our sentences "quicker" when we speak, as American-English speakers are wont to do, we drop the "on" and say "meet Monday".

Here is season two on PITE.

Meet Monday? Meet Monday?!? It must be Meet ON Monday!!

So, would you meet today? Or, would you meet ON today? Also, would you have met yesterday, or ON yesterday?

That message was spam. SPAAAAAAM!!!!

An adverb or adverbial phrase is required to complete the idea - when are we going to meet? The question is whether the day of the week is being used as a noun or as an adverb. It can be used both ways. If it is used as an adverb in and of itself, no preposition is required. If it is used as a noun, a preposition is required to create an adverbial phrase. Some of the other examples, e.g. "4 o'clock" are not commonly accepted as being capable per se of use as adverbs, and therefore must be used within an adverbial phrase.

Sounds like a hold over from the ablative in Latin to me.

Actually, I hear "let's meet 4 o'clock" all the time, at least in casual speech. If Monday can be an adverb, why can't 4 o'clock be one as well? They're both instances or periods of time. Interestingly, I hear "let's meet at 4", but never hear "let's meet 4."

I'm not a linguist, not even a native speaker of the language, but it seems to me that the reason "let's meet 4 o'clock" is acceptable and not "let's meet 4" can be sorted out at a simple semantic level of interpretation (or am I being too plain?) I reckon the former does not lend itself to ambiguity, while the latter might.

in general i'd say let's meet AT 4 o'clock, and not let's meet 4 o'clock.

Ignorance and laziness?