Most definitions found in this glossary are adapted with permission from this text book:

Maheu, M., Whitten, P., & Allen, A. (2001). eHealth, Telehealth & Telemedicine: A Guide to Startup and Success. New York: Jossey-Bass.

Browse the glossary using this index

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E – Mental Health

Generic term to describe the use of information and communication technology (ICT) - in particular the many technologies related to the Internet  - when these technologies are used to support and improve mental health conditions, including substance abuse and comorbid disorders.
Entry link: E – Mental Health


Is the act of offering medical prescriptions over the Internet. Often, prescriptions must be accompanied by a valid provider-client/patient relationship, which may or
may not require an in-person interaction between the prescriber and patient, depending on the state.
Entry link: E-Prescribing


Is a sonogram of the heart.

Entry link: Echocardiography


Is a radiology procedure that records deep structures of the body with ultrasonic waves.

Entry link: Echography


Originally, this term referred to telehealth (or telemedicine) provided specifically via the Internet. More recently, it is used more broadly by some to refer to electronic and digital processes in health. It can also be found spelled eHealth or e-health.
Entry link: ehealth

Electrocardiogram (ECG)

Is a test of the electrical activity of the heart, which helps detect problems such as heart attacks and arrhythmias.


Entry link: Electrocardiogram (ECG)

Electronic signature

The attachment of specific codes to an electronic document for purposes of authentication. The authentication process may make use of such technologies as passwords, cryptography, and biometrics.
Entry link: Electronic signature


A system of encoding data whereby the information can be transmitted, retrieved, and decoded only by the intended recipient, who holds the “key” to interpreting the message.

Entry link: Encryption