Frequency: The word is one of the 3000 most common words in English.
1.
If you say that something is not ~ the case, you mean that it may not be the case or is not always the case.
Anger is not ~ the most useful or acceptable reaction to such events...
A higher fee does not ~ mean a better course.
ADV: with neg, ADV group, ADV before v vagueness
•
If you reply ‘Not ~’, you mean that what has just been said or suggested may not be true.
‘He was lying, of course.’—‘Not ~.’
CONVENTION
2.
If you say that something ~ happens or is the case, you mean that it has to happen or be the case and cannot be any different.
The most desirable properties ~ command astonishingly high prices...
Tourism is an industry that has a ~ close connection with governments.
= inevitably
ADV: ADV before v, ADV group