1. Occurring, or taking place at daytime.

2. Active during daylight hours.

3. Reoccurring in the day, or daily.
As oppose to Nocturnal animals that are active at night some animals are Diurnal only becoming active in the day.
by NotKnownToYou April 3, 2009
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To be active or awake during the day.

Antonym of nocturnal
by The Gadd July 5, 2011
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The actual word for any animal or human who is active during the day and sleeps during the night.
Person 1: Haha dude, your sleeping habits are so weird. I'm just dayturnal.
Person 2: What the fuck is that?
Person 1: It means I sleep in the night and am active during the day. I saw it on Urban Dictionary, it was the word of the day!
Person 2: There's already a word for that fuckwit, it's called "diurnal." You can't just make up words that already exist. I guess Urban Dictionary is administrated by retards.
by Person McGuire July 6, 2011
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The opposite of nocturnal; by day.
Most people are diurnal, although some people are like night-owls and are nocturnal.
by Alfajor July 6, 2011
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A person who is straight when awake, but in dreams have sexual fantasies about others who are the same gender as him/herself. usually happens when stressed, having doubts about a relationship or after watching a chick flick/action movie.

Sarah: Hi john.

Sarah's BF John: hey sarah have any cool dreams lately?

Sarahs thoughts: dont say anything about the dream you had last night about mary....

Sarah: nope

John: oh okay.

Sarah's thoughts: i knew i shouldn't have watched "jennifers body" last night... damn megan fox turning me into a Diurnal Bisexual..
by asian_waffles February 10, 2010
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The way you can say "Same Shit: Different Day" to family, friends, boss, co-workers, priests, cops, Oprah Winfrey, Sarah Palin etc and sound highly literate.

It even has the same acronym (SSDD).
Scholar 1: "How goes the research into Shakespeare's use of Jungian allegory in his tragedies?"

Scholar 2: "Scatalogically Similar: Diurnal Discrepancy."

Scholar 3: "Ah yes, indeed." (Cluemeter reading zero)
by Uncle Des September 4, 2010
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The act of urinating into two urinals with one dick.
“I diurnaled at Veterans Stadium just so that fuck in the Emmitt Smith jersey had to wait.”
by John Koktosten November 14, 2019
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