1) A reader might use the surrounding words in the sentence to help figure out the meaning of an unfamiliar word.
2) A reader might use an image accompanied with the text to help figure out the meaning of an unfamiliar word.
3) A reader might use punctuation, occasionally an author will separate the definition of a word from the rest of the sentence using commas, or semicolons. To help figure out the meaning of an unfamiliar word.
That’s three so you should be good.