The Electromagnetic Spectrum. The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes â the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
Top definition. fathom. 1. a unit of mesuring distance that is 6 feet or about equal to the length of a grown man's outstreched arms. 2. to contemplate or think about with effort. 1.the shipwreck is about 10 fathoms down. 2.who but the almighty can fathom the depths of the abyss.
Word forms: plural , 3rd person singular present tense fathoms , present participle fathoming , past tense , past participle fathomed. 1. countable noun. A fathom is a measurement of 1.8 metres or 6 feet, used when referring to the depth of water. We sailed into the bay and dropped anchor in five fathoms of water. 2. verb [no cont] If you cannot fathom something, you are unable to understand it, although you think carefully about it.