thrice-weekly en · ADJ
Meanings
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(not-comparable) Occurring three times in one week.
New ships were built to the order of the Great Eastern Railway, and the service frequency increased, until March 1879, saw a sailing every weekday to Rotterdam, and a thrice-weekly service to Antwerp.
1951 November, K. Westcott Jones, “Parkeston Quay and the Antwerp Continental Service”, in Railway Magazine, page 760: