from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The science of measuring time.
- n. The art of making timepieces.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The art, science and technology of timekeeping and timekeepers, such as clocks, watches and sundials.
from the GNU version of the Collaborative International Dictionary of English
- n. The science of measuring time, or the principles and art of constructing instruments for measuring and indicating portions of time, as clocks, watches, dials, etc.
from The Century Dictionary and Cyclopedia
- n. A contrivance for measuring time; a timepiece.
- n. In the Gr. Ch., an office-book containing the offices for the canonical hours, from matins (mesonycticon) to complin (apodeipnon) inclusive, as well as antiphons, hymns, etc., from the menology and other books, some short occasional offices, and several canons of odes. Generally the calendar is prefixed.
- n. The science of measuring time, or the principles and art of constructing, regulating, testing, etc., machines for indicating divisions of time, as clocks and watches.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the art of designing and making clocks
Greek hōrā, hour, season; see yēr- in Indo-European roots + -logy.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin horologia, from hora + -logia (Wiktionary)