A-1 is the distance from the working edge of the rail to the first dowel. Handwork in Wood | William Noyes. Everything was A-1 of course; first-rate wines to choose from, and a rattling good cigar …


 · A-1: [adjective] the best. That new CD is so A-1 ! My girlfriend, yea she A1 . See more words with the same meaning: good, okay, cool, awesome, fun .

Define A-1. A-1 synonyms, A-1 pronunciation, A-1 translation, English dictionary definition of A-1. also A-1 adj. Informal First-class; excellent. American Heritage® Dictionary of …

Definition from Wiktionary, the free dictionary. Jump to navigation Jump to search. See also: a1, A1, and A-1

A1. A member of the Bcl-2 protein family encoded by BCL2A1, which counteracts apoptosis by growth-factor withdrawal. A1 expression permits accumulation of differentiated myeloid cells both before and after IL3 withdrawal. Murine A1 is a homolog of human BFL-1. …

Definition of a_1 indefinite article in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. We use cookies to enhance your experience on our website, including to provide targeted advertising and track usage.

A subset of the third-highest bond rating by Moody's.The other subsets are A2 and A3, both of which are slightly lower. Bonds with an A1 rating are investment-grade, meaning that banks are allowed to hold them. Bonds with A1 ratings are low-risk and low-return, though not as much as Aa and Aaa ratings.The rating is equivalent to the A+ rating by S&P and Fitch.

Definition of A1 1 : having the highest possible classification — used of a ship 2 : of the finest quality : first-rate