from The American Heritage® Dictionary of the English Language, 4th Edition
- prep. On. See Usage Note at on.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- prep. Being above and in contact with another.
- prep. Being directly supported by another.
- prep. At a prescribed point in time.
- adv. Being the target of an action.
- adv. Incidental to a specified point in time or order of action; usually combined with here-, there- or where-.
from the GNU version of the Collaborative International Dictionary of English
- prep. On; -- used in all the senses of that word, with which it is interchangeable.
from The Century Dictionary and Cyclopedia
- Up and on: in many cases scarcely more than a synonym of on, the force of up being almost or entirely lost. See on, preposition
- Upward so as to get or be on: involving motion toward a higher point.
- On, in any sense: conveying no notion of height, elevation, rise, or ascent. See on.
- See the verbs.
- Hereupon; thereupon; onward; on.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. being up to particular standard or level especially in being up to date in knowledge
From Middle English upon, uppon, uppen, from Old English upon, uppon, uppan ("on, upon, up to, against, after, in addition to"), equivalent to up (“adverb”) + on (“preposition”). Cognate with Icelandic up á, upp á ("up on, upon"), Swedish på ("up on, upon"). (Wiktionary)