| Period of rest | 14 |
| Period of reprieve | 18 |
| Period of relaxation | 20 |
| Period of rationing: Abbr. | 26 |
| Period of rationing (abbr.) | 27 |
| Period of rapid growth | 22 |
| Period of radio silence | 23 |
| Period of quiet | 15 |
| Period of quiescence | 20 |
| Period of prosperity | 20 |
| Period of preparation | 21 |
| Period of prayer? | 17 |
| Period of prayer | 16 |
| Period of powerlessness | 23 |
| Period of power | 15 |
| Period of play in curling | 25 |
| Period of penitence | 19 |
| Period of panic | 15 |
| Period of one's prime | 25 |
| Period of office | 16 |
| Period of occupancy | 19 |
| Period of note | 14 |
| Period of mourning in Judaism | 29 |
| Period of most activity | 23 |
| Period of metalwork advances | 28 |
| Period of meaningful interaction | 32 |
| Period of marked improvement? | 29 |
| Period of many years | 20 |
| Period of major fighting | 24 |
| Period of low activity | 22 |
| Period of little change | 23 |
| Period of literary style, e.g. | 30 |
| Period of life | 14 |
| Period of Lent, e.g. | 20 |
| Period of investor confidence | 29 |
| Period of instability, perhaps | 30 |
| Period of indulgence | 20 |
| Period of increased births | 26 |
| Period of inactivity | 20 |
| Period of imminent danger | 25 |
| Period of immaturity | 20 |
| Period of ignorance | 19 |
| Period of human history that began about 3,000 years ago | 56 |
| Period of human benightedness | 29 |
| Period of history | 17 |
| Period of high artistic development | 35 |
| Period of growth | 16 |
| Period of greatest success | 26 |
| Period of great prosperity | 26 |
| Period of great growth | 22 |
| Period of great glaciation | 26 |
| Period of gradual decline | 25 |
| Period of George W. Bush's presidency | 41 |
| Period of future bliss | 22 |
| Period of frigid temperatures | 29 |
| Period of focusing on oneself | 29 |
| Period of financial weakness | 28 |
| Period of fasting ended by Eid al-Fitr | 38 |
| Period of fasting | 17 |
| Period of expansion | 19 |
| Period of effectiveness | 23 |
| Period of economic growth | 25 |
| Period of duty | 14 |
| Period of douze mois | 20 |
| Period of distinction | 21 |
| Period of diminished returns for a stoner? | 42 |
| Period of development | 21 |
| Period of deprivation | 21 |
| Period of delay | 15 |
| Period of decreased income at ski resorts, e.g. | 47 |
| Period of decline | 17 |
| Period of darkness | 18 |
| Period of darkening | 19 |
| Period of crisis | 16 |
| Period of contract | 18 |
| Period of contemplation | 23 |
| Period of calm | 14 |
| Period of bacchanalia? | 22 |
| Period of antiquity | 19 |
| Period of adversity | 19 |
| Period of advancing glaciers | 28 |
| Period of abstinence | 20 |
| Period of a renter's lease | 30 |
| Period of a renter's agreement | 34 |
| Period of 40 weekdays | 21 |
| Period of 365 dÃas | 21 |
| Period named for an element | 27 |
| Period named for an earth goddess | 33 |
| Period marked by increased smelting | 35 |
| Period marked by distinctive character | 38 |
| Period marked by copper use | 27 |
| Period like a millennium | 24 |
| Period just before dark | 23 |
| Period just before | 18 |
| Period in which we live | 23 |
| Period in which the oboe d'amour was common | 47 |
| Period in the wire | 18 |
| Period in the pen, to a con | 27 |
| Period in the life of Tom Brown | 31 |
| Period in the earth's history | 33 |