Dic: require

Generally two kinds of meaning:

[1] △to need something △to need something; to depend on someone or something

• Campbell's broken leg will probably require surgery.　
• What's required is a complete reorganization of the system.　
• Most house plants require regular watering.

• These pets require a lot of care and attention.
• Deciphering the code requires an expert.
• This condition requires urgent treatment.
• Do you require anything else? (= in a store, for example)  ... [require something]

• A successful marriage requires us to show trust and loyalty. ... [require someone/something to do something]

• The situation required that he be present.  ... [require that…]

• Lentils do not require soaking before cooking.  ... [require doing something]

[2] △if you are required to do or have something, a law or rule says you must do it or have it. △[often passive] to make someone do or have something, especially because it is necessary according to a particular law or set of rules

• You are required by law to wear a seat belt.
• [require that]Regulations require that students attend at least 90% of the lectures. 
• The bill failed to get the required number of votes.  ... [be required to do sth]

• The wearing of seat belts is required by law.
• “Hamlet” is required reading (= must be read) for this course.
• Several students failed to reach the required standard.
• I just require a signature on the form. ... [require something]

• What exactly is required of a receptionist (= what are they expected to do)? ... [require something of someone]
• All candidates will be required to take a short test. ... [require someone to do something]
• We require that you comply with the following rules:…  ... [require that…]

..... LDOCE, OALD