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ONLINE DICTIONARY definition: a dictionary that is available on the internet. Online dictionaries like Dictionary.com offer immediate, direct access through large databases to a word's spelling and meanings, plus a host of ancillary information, including its variant spellings, pronunciation, inflected forms, origin, and derived forms, as well as supplementary notes about how the word is used ...
DICTIONARY definition: a book or digital resource (such as Dictionary.com) containing a selection of words and information about their meanings, pronunciations, etymologies, inflected forms, derived forms, etc., in either the same or another language; lexicon; glossary. See examples of dictionary used in a sentence.
ENGLISH DICTIONARY definition: a dictionary in which most of the entry words and all of their definitions, as well as supplementary material, are in English; a monolingual English dictionary, such as Dictionary.com. Terms from other languages that are commonly used by speakers of English are given language labels and often the foreign as well as Anglicized pronunciations. See examples of ...
In the same way, using "for" in ideas on improving the team means you support improving the team while using "on" doesn't necessarily mean so. It's all connotation and subconscious language use and effects.