noun

• The combined application of science and art in practical ways in industry, as for example in designing new machines.
• Machines or equipment thus designed.
• (countable) Any useful skill or mechanism that humans have developed or invented (including in prescientific eras).
• (countable, figurative) Any useful trait that has evolved in any organism.
• (uncountable, academic) The study of or a collection of techniques.
• (archaic) A discourse or treatise on the arts.