Last week, one of my students made a sentence using the word "secondment". I didn't know the word and asked him to repeat it. My students sometimes make up words that seem like they should be correct English words, but aren't. I didn't think that was the case this time. This student is an upper level student and has a good vocabulary. I asked him to write the word on the board and I told him I don't know every English word and needed to look it up. I looked it up on Dictionary.comand found this definition:
He had used the word correctly and it was a word I had never heard before. I often learn things from my students. I even learn how to speak English from them! A big thank you for teaching me a new word!