Definition of "ar"

I have drunk en-ee-cee-tee-ay-ar from the ef-ell-oh-doubleyou-ee-ar-ess in his gee-ay-ar-dee-ee-en many a time.

2004, Will Rogers, The Stonking Steps, page 170

RV [is spoken] as "ar-vee" instead of "I SPELL Romeo Victor".

2016 CCEB, Communications Instructions Radiotelephone Procedures: ACP125 (G), p. 3-5

But commonlie, the fairest bodies, ar bestowed on the foulest purposes.

1570, Roger Ascham, The Scholemaster