the way people live at a particular time and placeretirees enjoying a more casual, stress-free lifestyle

in 1915

• omitting
• omnibus
• omnibuses
• omnipotent
• omnipresent
• omniscient
• omnium-gatherum
• omnium-gatherums
• omnivore
• omnivores
• omphali
• omphalos
• on
• on account of
• on a dime
• on all hands
• on-and-off
• on an even keel
• on a sudden
• once
• once in a blue moon
• once in a while
• on cloud nine
• oncoming
• on deck