This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In an explicit manner.

ad. In an explicit manner; clearly; plainly; without disguise or reservation of meaning; not by inference or implication.

Plainly; without disguise or reservation of meaning; not by inference or implication; clearly; unmistakably: as, he explicitly avows his intention.

ad. in an explicit manner

"Refined flour products “wheat flour” or “enriched wheat flour” is essentially the same as white flour, unless the label explicitly lists “whole wheat flour” as the first ingredient."

clearly    plainly   

implicitly