(ת') הולך ופוחת, נמצא בירידה

(פ') להפחית, לצמצם; לרדת

באנליזה מתמטית, פונקציה ממשית  היא פונקציה עולה בקטע נתון, אם לכל בקטע מתקיים . בדומה, פונקציה יורדת היא כזו המקיימת לכל . אחת השאלות הבסיסיות בחקירה של פונקציה ממשית היא איתור התחומים שבהם היא עולה או יורדת.

להמשך המאמר ראה Wikipedia.org...

adj. lessening; diminishing

v. reduce, lessen; decline

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Adjective
1. becoming less or smaller
(antonym) increasing
(similar) abating, subsiding
2. music
(antonym) increasing
(similar) allargando

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Noun
1. a change downward; "there was a decrease in his temperature as the fever subsided"; "there was a sharp drop-off in sales"
(synonym) lessening, drop-off
(antonym) increase
(hypernym) change, alteration, modification
(hyponym) shrinking, shrinkage
(derivation) lessen, minify
2. a process of becoming smaller or shorter
(synonym) decrement
(antonym) increase, increment, growth
(hypernym) process
(hyponym) decay, decline
(derivation) diminish, lessen, fall
3. the amount by which something decreases
(synonym) decrement
(antonym) increase, increment
(hypernym) amount
(hyponym) drop, dip, fall, free fall
(derivation) diminish, lessen, fall
4. the act of decreasing or reducing something
(synonym) diminution, reduction, step-down
(antonym) increase, step-up
(hypernym) change of magnitude
(hyponym) cut
(derivation) diminish, lessen, fall

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Verb
1. decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fall to under a hundred pounds"; "his voice fell to a whisper"
(synonym) diminish, lessen, fall
(antonym) increase
(hypernym) change magnitude
(hyponym) break
(derivation) diminution, reduction, step-down
2. make smaller; "He decreased his staff"
(synonym) lessen, minify
(antonym) increase
(hypernym) change, alter, modify
(hyponym) mitigate
(derivation) lessening, drop-off

v. snížit (se); klesnout

Czas. zmniejszać (się)