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to scale = to climb up or over; ascend: scaled the peak
scalable = expandable
A "highly scalable" device or application implies that it can handle a large increase in users, workload or transactions without undue strain.
[FONT="]S[/FONT][FONT="]calability[/FONT][FONT="] is a positive feature of a product that is sold to fast-growing companies, because it implies that growth can be accommodated without having to make major changes or learn new procedures.
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scalable = if piece of computer hardware or software (or a firm) is scalable, it continues to work well even if it is made bigger or connected to a larger number of other pieces of equipment.
Property of a system that can accommodate changes in transaction volume without major changes to the system. Scalability most often comes into play when a system user anticipates growth in his business. You would not want to make a significant investment in any system, such as a fulfillm[/FONT][FONT="]ent[/FONT][FONT="] system, if it cannot grow as your business grows. On the other hand, you do not want to pay for excess capacity while you wait for growth to happen. A scalable system can be downsized as easily as it can grow. A server for a Web site has scalability if it can accommodate extreme peaks and valleys in user traffic