upwards of
Synonym discussion
Sense: preposition/1
'Upwards of' carries the implication that the real figure is probably higher than the stated minimum — it is not simply a synonym for 'more than'. 'More than' is a neutral statement of excess with no extra nuance about uncertainty. 'At least' sets a floor and admits the possibility of exact equality (at least ten could be exactly ten), whereas 'upwards of ten' suggests eleven or more. 'In excess of' is the formal equivalent, found in legal documents and financial reports. 'Over' is the most conversational choice and is widely interchangeable with 'more than' in casual speech. For example: 'The concert drew upwards of twenty thousand fans' (suggesting the real number was higher) versus 'The concert drew more than twenty thousand fans' (a simple factual claim).
Etymology
The phrase 'upwards of' dates back to the early 1500s, formed by combining the adverb 'upward(s)' (meaning 'toward a higher place or position') with the preposition 'of'. Originally used with a literal spatial meaning ('higher than'), it gradually shifted to figurative use with numbers and amounts by the 1600s. The variant 'upward of' (without the 's') emerged around the same time and remains common in American English.
First known use
1683
1683, in the meaning defined above