A student has a english problem, should he get another chance and have another chance?
You'll probably get a better answer after the question is closed, edited for clarity, and reopened.
I have had multiple experiences of this for students for whom English is not their first language. "What is 'ferris wheel'"? Taking a trigonometry test and we were using the ferris wheel in a test question. ('We', but I did not author the test. I was just proctoring). No, I don't expect a student to know what a ferris wheel is, and in fact, schools in mt area of the US are trying to do a better job of cultural awareness. I proceeded to explain what this ride was, showed him a picture of one, and how it worked.
Similar for a test question regarding probability where the teacher uses playing cards, the standard 52 card deck. When I was your age (in the late 1970's), there were no computers, no video games. Cards were ubiquitous. English language aside, students would have a near 100% chance of knowing what any reference to a card deck meant. Now, such an assumption would be wrong, and it's on the teacher to introduce the deck of cards as if no one had ever played with it.
If the student didn't understand a math vocabulary word, and it's not language-related, I wouldn't adjust the grade. It's one test/quiz of many.
Pretty open-ended questions since there aren't any specifics, so I'll give my scenarios:
I wouldn't allow another chance if it was mathematically-related word that would have been seen in a previous year. For example a high school student asking what a "numerator" is, or a "sum", or a "factor" etc. (I don't think it's unfair to set a standard of require knowledge based on prerequisite courses)
I might allow another chance if most students couldn't answer it, and the question couldn't be understood contextually. For example, I could make up words but I don't think they effect the math, like this: "A qwert has 10 werts and each wert has 5 erts. If I have 3 qwerts, how many erts do I have?" Although those are made-up words, I think the question could be done regardless. (In fact, since I use metric, this is how I usually think of imperial units words)
Could we see the question?