| Occurred as a result | 20 |
| Occurred to (with ''on'') | 41 |
| Occurred to (with "on") | 33 |
| Occurred to a person suddenly | 29 |
| Occurred to, with "on" | 32 |
| Occurrence | 10 |
| Occurrence after retiring | 25 |
| Occurrence after the fall | 25 |
| Occurrence after the first and third quarters of the moon | 57 |
| Occurrence at many a lecture | 28 |
| Occurrence at the moon's first quarter | 42 |
| Occurrence before the chute opens | 33 |
| Occurrence in the moon's first quarter | 42 |
| Occurrence of events not quite eerily at the same time? | 55 |
| Occurrence of importance | 24 |
| Occurrence of incoming water | 28 |
| Occurrence of note | 18 |
| Occurrence on "Black Friday," Sept. 19, 1873 | 54 |
| Occurrences | 11 |
| Occurrences between springs | 27 |
| Occurrences in alleys | 21 |
| Occurrences on icy roads | 24 |
| Occurring | 9 |
| Occurring 24 times a day | 24 |
| Occurring 40 to 55 million years ago | 36 |
| Occurring after 1945, e.g. | 26 |
| Occurring after surgery, briefly | 32 |
| Occurring among kin | 19 |
| Occurring annually | 18 |
| Occurring around the 30th, as store sales: abbr. | 48 |
| Occurring as an isolated instance | 33 |
| Occurring as you watch it | 25 |
| Occurring before surgery, informally | 36 |
| Occurring before the Renaissance, e.g. | 38 |
| Occurring before: Abbr. | 23 |
| Occurring by turns, old style | 29 |
| Occurring every 60 minutes | 26 |
| Occurring every eighth day | 26 |
| Occurring every nine weeks, roughly | 35 |
| Occurring every other leap year, say | 36 |
| Occurring every other year | 26 |
| Occurring every second year | 27 |
| Occurring every sixty minutes | 29 |
| Occurring every third year | 26 |
| Occurring in regular succession | 31 |
| Occurring in small knots | 24 |
| Occurring in stages | 19 |
| Occurring in the middle | 23 |
| Occurring in the usual place | 28 |
| Occurring involuntarily | 23 |
| Occurring irregularly | 21 |
| Occurring last month | 20 |
| Occurring later: Prefix | 23 |
| Occurring naturally | 19 |
| Occurring near the sun | 22 |
| Occurring on 12/31 | 18 |
| Occurring once in a century | 27 |
| Occurring only a single time | 28 |
| Occurring relatively soon | 25 |
| Occurring shortly after civil twilight begins | 45 |
| Occurring someday | 17 |
| Occurring twice a year | 22 |
| Occurring within Ohio's borders e.g. | 41 |
| Occurs | 6 |
| Occurs (to) | 11 |
| Occurs afterward | 16 |
| Occurs earlier | 14 |
| Occurs next | 11 |
| Occurs to | 9 |
| Occurs to, with "on" | 30 |
| Occurs, poetically | 18 |
| OCD-beset TV sleuth | 19 |
| Ocean | 5 |
| Ocean "crossing" this puzzle's four longest answers (abbr.) | 73 |
| Ocean abutting N. Car. | 22 |
| Ocean abysses | 13 |
| Ocean access route | 18 |
| Ocean algae | 11 |
| Ocean algae used for food | 25 |
| Ocean area | 10 |
| Ocean areas | 11 |
| Ocean arm | 9 |
| Ocean arms | 10 |
| Ocean banks | 11 |
| Ocean bed | 9 |
| Ocean behemoth | 14 |
| Ocean between Eur. and Amer. | 28 |
| Ocean bird | 10 |
| Ocean birds | 11 |
| Ocean blue | 10 |
| Ocean bordered | 14 |
| Ocean borders | 13 |
| Ocean bottom | 12 |
| Ocean bottoms | 13 |
| Ocean breeze | 12 |
| Ocean burrowers | 15 |
| Ocean catch | 11 |
| Ocean catches | 13 |
| Ocean channel | 13 |
| Ocean channel markers | 21 |