science and engineering; science and technology
Refers to the combined fields of science and engineering, often used in academic contexts such as 理工学部 (faculty of science and engineering).
彼は理工学部で物理学を専攻している。
He is majoring in physics in the faculty of science and engineering.
He has continued his research in the field of science and engineering for many years.
Students in science and engineering fields are often good at mathematics.
She is thinking of studying science and engineering at university.
工学 refers specifically to engineering, while 理工 is the broader term combining engineering with pure science.
Compound of 理 (り, 'science, reason') and 工 (こう, 'engineering, industry'). The reading りこう is a standard on'yomi combination.