PERIODS

An amount of time

Example: "A time period of 30 years"

• period of time
• time period

• fundamental measure
• fundamental quantity

• test period
• trial period
• time frame
• grace  8
• • grace period
  • hours  8
  • downtime  14
  • uptime  10
  • work time
  • time off
  • bout  6
  • hospitalization  29
  • travel time
  • times  7
  • time  6
  • elapsed time
  • continuance  15
  • duration  9
  • calendar week
  • week  11
  • midweek  17
  • field day
  • life  7
  • life-time
  • lifespan  13
  • lifetime  13
  • life  7
  • life  7
  • millenary  14
  • millennium  14
  • bimillenary  18
  • bimillennium  18
  • occupation  16
  • past  6
  • shelf life
  • puerperium  16
  • lactation  11
  • time of life
  • calendar day
  • civil day
  • festival  14
  • day  7
  • daylight  16
  • daytime  13
  • forenoon  11
  • morn  6
  • morning  10
  • morning time
  • dark  9
  • night  9
  • nighttime  15
  • night  9
  • night  9
  • night  9
  • eve  6
  • evening  11
  • hebdomad  17
  • week  11
  • fortnight  16
  • two weeks
  • weekend  15
  • indian summer
  • saint martin's summer
  • year  7
  • school  11
  • school day
  • schooltime  17
  • twelvemonth  22
  • year  7
  • yr
  • year  7
  • semester  10
  • bimester  12
  • olympiad  16
  • lustrum  9
  • decade  10
  • decennary  15
  • decennium  14
  • century  12
  • quadrennium  23
  • quinquennium  32
  • half-century
  • quarter-century
  • quarter  16
  • phase of the moon
  • day  7
  • calendar month
  • month  10
  • mid-january
  • mid-february
  • mid-march
  • mid-april
  • mid-may
  • mid-june
  • mid-july
  • mid-august
  • mid-september
  • mid-october
  • mid-november
  • mid-december
  • time limit
  • term  6
  • trimester  11
  • hour  7
  • silly season
  • golden age
  • silver age
  • bronze age
  • iron age
  • great year
  • platonic year
  • regulation time
  • extra time
  • overtime  13
  • season  6
  • time of year
  • canicular days
  • canicule
  • dog days
  • midwinter  15
  • season  6
  • season  6
  • age  4
  • years  8
  • long haul
  • drought  12
  • drouth  10
  • epoch  12
  • era  3
  • generation  11
  • prehistoric culture
  • prehistory  18
  • reign  6
  • run  3
  • early days
  • youth  11
  • dawn  8
  • evening  11
  • time  6
  • nap  5
  • sleep  7
  • lease  5
  • term of a contract
  • half-life
  • lunar time period
  • tide  5
  • phase  10
  • stage  6
  • multistage  13
  • watch  13
  • peacetime  15
  • wartime  12
  • duty tour
  • enlistment  12
  • hitch  13
  • term of enlistment
  • tour  4
  • tour of duty
  • honeymoon  17
  • indiction  12
  • prohibition  18
  • prohibition era
  • incubation period
  • rainy day
  • noviciate  14
  • novitiate  12
  • bloom  9
  • blossom  11
  • efflorescence  23
  • flower  12
  • flush  11
  • heyday  16
  • peak  10
  • prime  9
  • running time
  • clotting time
  • air alert
  • question time
  • study hall
  • usance  8
  • window  13
  • mornight
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The interval taken to complete one cycle of a regularly repeating phenomenon

• interval  11
• time interval

• orbit period

(ice hockey) one of three divisions into which play is divided in hockey games

A unit of geological time during which a system of rocks formed

Example: "Ganoid fishes swarmed during the earlier geological periods"

• geological period

• geologic time
• geological time

• glacial epoch
• glacial period
• ice age

The end or completion of something

Example: "Death put a period to his endeavors"

The monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause

Example: "The women were sickly and subject to excessive menstruation"

• catamenia  13
• flow  10
• menstruum  13

• discharge  16
• emission  10
• expelling  19

• hypermenorrhea
• menorrhagia  17
• oligomenorrhea

A punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations

Example: "In england they call a period a stop"

• full point
• full stop
• point  7
• stop  6

• punctuation  15
• punctuation mark

• suspension point