Beacon

1. n. That which gives notice of danger.
2. n. A signal fire to notify of the approach of an enemy, or to give any notice, commonly of warning.
3. n. A signal or conspicuous mark erected on an eminence near the shore, or moored in shoal water, as a guide to mariners.
4. n. A high hill near the shore.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.