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up‧per‧most

1 if something is uppermost in your mind, you think about it a lot because it is very important to you :
A feeling of pity for David was uppermost in her mind.
be uppermost in your mind
A feeling of pity for David was uppermost in her mind.2 [not before noun] more important than anything else :
The one word which seems to be uppermost in every discussion is money.
The one word which seems to be uppermost in every discussion is money.3 [usually before noun] higher than anything else :
the uppermost windows of the house
the uppermost windows of the house —uppermost adverb:
She turned her hand over, palm uppermost.
She turned her hand over, palm uppermost.