Sufficient or satisfactory for a particular purpose.
“The tenant argued that two weeks was not adequate notice to vacate the apartment.”
“She confirmed that the training provided was adequate for the new role.”
In formal letters, 'adequate' is often used to describe whether something, such as notice, funding, or staffing, meets a required standard. In Reading Part 1, watch for questions asking whether something was 'adequate' or not, since this is a common way test writers check if you understood the writer's opinion.
Synonyms: sufficient, satisfactory, acceptable