one-tenth noun 1one tenth number 1 noun1 •One of ten equal parts (1/10, ⅒, 0.1).As with most other railways, freight revenue is the mainstay of the balance sheet. In Canada, passenger revenue is only about one-tenth that of freight. — 1959 one tenth number1 •A minuscule amount, in comparison to something or someone else.He wanted to be one tenth the man and the Spacer M'tai had been – or any of those great pioneers. — 1998