Which term refers to a space where no particles of matter exist?

The term that refers to a space where no particles of matter exist is "Vacuum." A vacuum is defined as an area devoid of matter, including air and other particles. This concept is vital in fields such as physics and engineering, especially when discussing topics like space, pressure, and the behavior of gases.

In this context, a vacuum implies that there is a complete absence of any physical substances, which is a fundamental characteristic that differentiates it from other states or conditions. Understanding the properties of a vacuum is essential for various applications, including creating controlled environments in laboratories or understanding phenomena in astrophysics.

The other terms do not pertain to this meaning: "Viscous" refers to the thickness or stickiness of a liquid; "Surreptitious" relates to something done secretly or stealthily; and "Transcendent" describes something that goes beyond ordinary limits. None of these terms align with the definition of a space devoid of matter, reinforcing why vacuum is the appropriate choice for this question.