different between activity vs polysomnogram

English

Etymology

From Middle French activité, from Latin activitas. Equivalent to active +? -ity.

Pronunciation

• IPA^(key): /æk?t?.v?.ti/, /æk?t?.v?.ti?/, /æk?t?.v?.ti/
• Rhymes: -?v?ti

Noun

activity (countable and uncountable, plural activities)

1. (uncountable) The state or quality of being active; activeness.

2. (countable) Something done as an action or a movement.

3. (countable) Something done for pleasure or entertainment, especially one involving movement or an excursion.

4. (grammar, semantics) The lexical aspect (aktionsart) of verbs or predicates that change over time and have no natural end point.

Usage notes

• Adjectives often used with "activity": increased, decreased, high, low, volcanic, seismic, eruptive, intellectual, physical, mental, spiritual, muscular, cerebral, favorite, recreational, practical, cultural, artistic, literary, musical, political, diplomatic, military, domestic, voluntary, missionary, chemical, optical, productive, reproductive, industrial, commercial, etc.

Synonyms

• See also Thesaurus:activity

Antonyms

• rest
• passivity

Derived terms

• activity book
• activity stream
• activity trap
• beehive of activity
• catalytic activity
• extravehicular activity
• hive of activity
• nonactivity
• optical activity
• overactivity
• radioactivity
• self-activity
• subactivity
• ultrahazardous activity
• underactivity
• zone of polarizing activity

Translations

Further reading

• activity in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• activity in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

English

Etymology

poly- +? somno- +? -gram

Noun

polysomnogram (plural polysomnograms)

1. A record of a person's sleep activity obtained using polysomnography.