The writer searched two dictionaries and a thesaurus before finding the perfectly apposite word he was looking for.
Apprise
to inform
Nadine Cohodas's biography of the blues singer Dinah Washington keeps the reader apprised of the racism black America had to endure.
Approbation
praise; approval
The Congressional Medal of Honor is the highest approbation an America soldier can receive.
Apropos
relevant
Apropos of nothing, the speaker declared that the purpose of life is to love.
Ardor
great emotion or passion
The twentieth century American poet Wallace Stevens said, "It is the unknown that excited the ardor of scholars, who, in the known alone, would shrivel up with boredom.