Correct spelling, explanation: expense is a word of Latin origin as it comes from the word expensa. In the process of assimilation to the English language, the word lost the characteristic Latin a at the end which changed to e. Besides that, the form did not change much, so expense remains the only correct form.
Definition of expense:
1. The number of means (usually financial) required to do something
The company paid all expenses of the office party.
The expense of living alone is higher than I ever thought.
Idioms with expense:
at the expense of – at the cost of (figurative and literal), usually implying negative experiences/consequences.
He used to eat a lot of fast food at the expense of his health.
The country could improve the healthcare sector, but only at the expense of underfunding other sectors.
Incorrect spelling, explanation:
expence would be pronounced the same as expense which may lead to errors. This is not the correct word, because of the origin of the correct version – expense. Because of its Latin origin (expensa), the word does not need a change of s to c.
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