mega-

mega-

pref.

1. Large: megadose.

2. Surpassing other examples of its kind; extraordinary: megahit.

3. One million (10⁶): megahertz.

---

[Greek, from megas, great; see meg- in Indo-European roots.]

---

mega-

combining form

1. denoting 10⁶: megawatt

2. (in computer technology) denoting 2²⁰ (1 048 576): megabyte

3. large or great: megalith

4. Informal very great: megastar [Greek megas huge, powerful]

---

mega-

1. A prefix that means:

2. Large, as in megadose, a large dose.

3. One million, as in megahertz, one million hertz.

4. 2²⁰ (that is, 1,048,576), which is the power of 2 closest to a million, as in megabyte.