I have come across a couple sentences in a text I'm learning and I thought Ihr was the formal meaning of your. In these two sentences it seems like there referring to you as in talking to the readers. Here they are. Shouldn't it be Sie or something else? I looked for grammar definitions and couldn't find anything so I thought I would ask on the forum.
"So, ich hoffe Ihr habt wieder viele neu Wörter gelernt."

"Wenn Ihr Lust habt,"

"Ihr" can have several meanings. In this case it's the plural version of "you". It is addressed to more than one person.

By the way, there is a typo in your Sentence: "So, ich hoffe Ihr habt wieder viele neue Wörter gelernt." It is "neue" instead of "neu". You have to use the adjective, not the adverb in this case.

Thanks Veral. Yes, that is a mistake on my part, it was neue. I just haven't come across this form of this you yet, either its du or Sie. I really need to get a good grammar book, I like LingQ but I think it really needs to be used with a grammar book to make quicker progress so the learner isn't confused so often.