A.

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acre; acres.
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acre; acres.
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ampere; amperes.
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are; ares.
Baseball. assist; assists.
Agnolo (di Cosimo di Mariano)
[ah-nyaw-law dee kaw-zee-maw dee mah-ryah-naw] /ˈɑ nyɔ lɔ di ˈkɔ zi mɔ di mɑˈryɑ nɔ/ (Show IPA), 1502–72, Italian painter.
Contemporary Examples

On all-knowing moms… A. Holden Caulfield B. Justin Bieber 10.
Justin Bieber or Holden Caulfield? Jaimie Etkin October 12, 2010

But police had never heard of “Kassim, A.” — the name written as the sender.
Burundi’s Black Market Skull Trade Margot Kiser January 25, 2014

A mid-level yakuza member, A. Kobayashi, left his organization in 2013.
Where Have Japan’s Yakuza Gone? Jake Adelstein, Nathalie-Kyoko Stucky March 8, 2014

A. People with family income between 100 and 400 percent of the poverty level.
The Obamacare Quiz: The Results The Daily Beast September 29, 2013

A greater “transparency” could easily backfire, doing greater harm than help to democracy: Murray A. No and no.
Readers Support Greater Supreme Court Transparency Ryan Prior March 27, 2012

Historical Examples

Published by A. Vandal in the “Revue bleue,” mars—avril, 1895.
The Life of Napoleon Bonaparte William Milligan Sloane

I did not want her to fall in love with A. Carleton Heathcroft, certainly.
Kent Knowles: Quahaug Joseph C. Lincoln

Its foliage is light and graceful, and quite unlike that of A. imbricata, having nothing of its stiff formality.
The New Gresham Encyclopedia. Vol. 1 Part 2 Various

At ten o’clock A. M. I received my commission of second lieutenant.
Three Years in the Federal Cavalry Willard Glazier

Mr. Flinn was then removed to the Adventure; and Mr. A. Millar put into his place.
Narrative of the surveying voyages of His Majesty’s ships Adventure and Beagle, between the years 1826 and 1836 Robert FitzRoy

abbreviation
acre(s) or acreage
America(n)
answer
noun
Il, real name Agnolo di Cosimo. 1503–72, Florentine mannerist painter
acre
adjective
Latin anno (in the year)
Latin annus (year)
anode
answer
Latin ante (before)
anterior
artery