Sentence:  A dress length of 8 <WSD>metres</WSD> of the best quality costs 58 francs. 
Meaning of the word marked with <WSD> tags:  The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to (127) (approximately 39.37) imperial inches.