attendance, presence,
No. Absence is a noun. It is generally the antonym of "presence."
There is no antonym for emphasis. The absence of emphasis is entirely unremarkable, and does not constitute an unemphasis.
There is no antonym for avenue; the opposite of avenue, street, or road is the absence of an avenue, street, or road.
absence, departure, disappearance, and leaving<------
Heterarchy. "Anarchy" is the antonym of rule-of-law, and describes a specific political state where there is an absence of government.
The word irrigation does not have an antonym. The opposite would simply be the absence of irrigation. Some synonyms are flooding, soaking, sprinkling, watering, and inundation.
It is an antonym of war. I'm not sure what you mean... the word peace can't be an antonym unless it's compared to its opposite, such as war.
An antonym for "candle" could be "darkness," as a candle provides light, while darkness represents the absence of light. Another possible antonym is "extinguish," which refers to the act of putting out a candle's flame.
The word column does not have an acronym. The opposite would just be the absence of a column. Some synonyms for column are file, line, row, procession, and queue.
to give up or forfit quit === === deafness, or rejection
The antonym for metacognition is likely "noncognition" or simply "cognition." Noncognition refers to the absence of metacognitive processes, while cognition encompasses general thinking and understanding without the added layer of metacognition.
Roget's Thesaurus lists no antonyms for the word 'ocean'. 'Desert' might possibly be considered to be an antonym (loosely). If one considers the "ocean" to be the abundance of water, one might consider the "desert's" absence of water to be the opposite.