Definition of lo exclamation in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. This disambiguation page lists articles associated with the title Lo. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. The meaning of LO is —used to call attention or to express wonder or surprise. How to use lo in a sentence. Idiom lo and behold (Definition of lo from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press) LO definition: look! see! (frequently used in Biblical expressions; now usually used as an expression of surprise in the phraselo and behold ). See examples of lo used in a sentence. The programme made great use of time-lapse photography and of the nearest available metaphor: lo, the white blanket later became 'a white duvet'. LO meaning: 1. used to tell people to pay attention and look at something interesting 2. used to tell people to…. Learn more. Inherited from Middle English lo, loo, from Old English lā (“exclamation of surprise, grief, or joy”). Conflated in Middle English with lo! (interjection), a corruption of lok!, loke! (“look!”) (as in lo we!(look we!)). Cognate with Scots lo, lu (“lo”). See also look. Define lo. lo synonyms, lo pronunciation, lo translation, English dictionary definition of lo. interj. Used to attract attention or to show surprise. American Heritage® Dictionary of the English Language, Fifth Edition. The word lo functions primarily as an interjection, capturing attention or emphasizing surprise. However, in its informal use as an abbreviation of low, it can function as an adjective or part of a compound modifier.