meist
mostly
Used as an adverb to express that something is true in most cases or for most of the time. Synonymous with "meistens" (usually/mostly).
Am Wochenende schlafe ich meist lange aus.
On weekends, I usually sleep in late.

mostly / most
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mostly
Used as an adverb to express that something is true in most cases or for most of the time. Synonymous with "meistens" (usually/mostly).
Am Wochenende schlafe ich meist lange aus.
On weekends, I usually sleep in late.

The forms 'meist', 'die meisten', and 'am meisten' are all superlatives of 'viel' (much/a lot). They express the greatest amount, frequency, or highest degree.
Er liest viel, aber sein Bruder liest am meisten.
He reads a lot, but his brother reads the most.
As an adverb, 'meist' means something like 'normally' or 'usually'. It can stand at the beginning of the sentence (position 1) or in the middle of the sentence (often after the verb).
Meist gehe ich am Sonntag spazieren.
Usually I go for a walk on Sunday.
The form 'die meisten' (most) is used like an adjective before a plural noun. It refers to the majority of a group and is always declined.
Die meisten Menschen mögen Schokolade.
Most people like chocolate.
The form 'am meisten' (the most) is an adverb and is not declined. It modifies a verb and expresses the highest degree.
Diese Serie gefällt mir von allen am meisten.
Of all of them, I like this series the most.
more
'mehr' and 'meist' look similar, but they do not mean the same thing. 'mehr' talks about a larger quantity or a higher degree. 'meist', on the other hand, means 'in most cases' or 'usually'. In forms like 'die meisten' or 'am meisten', it is also about a majority or the highest degree. Learners may confuse the words because both are connected to 'viel' (much / many). Remember: 'mehr' compares amounts, while 'meist' describes what usually happens or what applies to the majority.

Mein Freund besucht seine Familie meist am Sonntag.
My friend usually visits his family on Sundays.
Nach der Nachricht hatte meine Kollegin mehr Fragen als vorher.
After the news, my colleague had more questions than before.