to carefully watch, listen to, or examine something over a period of time, to check for any changes or developments

a book or other piece of writing that is related to learning or intended for study

ideas or guesses, rather than facts

to disagree with something, especially by saying that the opposite is true

a piece of information that helps you solve a crossword puzzle, answer a question etc

to look for information in a book, map, list etc

an idea of how something is, or how something should be done

the words that come just before and after a word or sentence and that help you understand its meaning

to form an opinion that something is probably true because of information that you have