according to; to be based on ~
に即して means 'according to' or 'in line with', indicating that an action or decision is based on a set of rules, facts, or circumstances.
に即して is a formal, written expression used to say that something is done in accordance with a standard or the actual situation. It suggests a close adherence to the given basis, often implying that the action is practical or realistic rather than theoretical. For example, when making a decision, you might say you are acting 現状に即して (based on the current situation). It is common in business, legal, and academic contexts. Note that the て-form (に即して) is often used adverbially, but you may also see に即した before a noun, as in 現実に即した対策 (measures based on reality).