Thee existing answer is over six years old, has already pointed the distinction between is key and is the key, and the original phrase is evidently standard when it appears so often in writing.

Apr 26, 2020 · An answer key is a key to the answers (to a test or exercise). It's usually a copy of the test or exercise with the instructor's idea of the best possible answers written in.

Jun 14, 2015 · 3 As an adjective, key can mean "Of crucial importance" (Oxford). For example: the key facts are the most important facts, or a key worker is an employee whose role is …

Aug 10, 2017 · I tried Google Ngram viewer and see a lot of instances of the phrase "low key" even before the era of photography. However, these instances seem to be using the term …

Sep 6, 2016 · It seems like the proper use is the singular Key, especially if it is a complete section. This is similar to a Legend, which is defined as a table on a map, chart, or the like, listing and …

Feb 9, 2011 · What is the difference between a legend or a key? Is it still called a legend if it is located at the top, rather than the bottom of results?

Dec 4, 2020 · It’s time to bring the message home and key into the faith dimension, national security issues and business sector, by outlining both risks and opportunities. In this context, …

Mar 11, 2024 · The use of key to mean a central stone in an arch goes back to 1339, the key or keystone both looking a little like a key (often a long thin peg) and serving the function of …

Key to exercises. Today I saw the quoted sentence when looking at the keys to exercises, and afterwards that sentence got me thinking why the preposition to is used here instead of for. …

Why is this term used instead of the word pressed, which has a simple and intuitive meaning? Some alternative terms that could be a better fit are pushed, clicked, or activated. As someone …