What does availability mean?
Availability refers to the condition of being obtainable, accessible, or ready for use. It describes both tangible things — products in stock, rooms free to book, data retrievable on demand — and intangible ones, such as a person's time or attention being uncommitted. The word carries no strong emotional charge; it functions as a practical measure of supply, readiness, or openness. In business and commerce it signals what can currently be purchased or secured, while in personal contexts asking after someone's availability is a polite way of arranging a meeting without presuming their time. In computing and engineering, availability takes on a more precise meaning, denoting the fraction of time a system remains operational, often expressed as a percentage such as '99.9% uptime.' Derived from the Latin root valere, 'to be strong or worth,' availability ultimately connects strength and value with presence — something counts as available when its usefulness is genuinely within reach.
nounThe state or quality of being able to be used, obtained, or reached; the degree to which something is accessible or ready for use.
- The quality of being obtainable or accessible (e.g., goods, services, information).
- The fact that a person is free or not otherwise engaged at a given time.
- In computing: the proportion of time a system or service is operational and usable.
"Check the availability of tickets before making travel plans."
"The availability of affordable housing has become a pressing concern in many cities."
"Please confirm your availability for a call next week."
From the Latin valere — 'to be strong' — availability is literally about how much 'value' is on hand for you right now.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of availability
Availability derives from the verb 'avail,' which came into Middle English from Anglo-Norman French 'availler,' itself from Late Latin 'ad valere,' meaning 'to be of value or worth.' The Latin root valere ('to be strong') also underlies words such as 'valid,' 'valor,' and 'prevail.' The adjective 'available' formed first, and 'availability' was subsequently derived from it; it became well established in English by the early modern period and gained new technical prominence with the rise of computing in the twentieth century.
Related word forms
How availability is actually used
A neutral, slightly formal term common in business, technical, and everyday contexts. In computing, 'high availability' is an established term of art referring to systems designed for near-continuous uptime.
Easily confused with availability
"Availability" refers to whether something can be obtained or is on hand, while "accessibility" refers to whether it can actually be reached, entered, or used by a particular person.