Princeton's WordNet

1. ecology(noun)

   the environment as it relates to living organisms

   "it changed the ecology of the island"

2. ecology, bionomics, environmental science(noun)

   the branch of biology concerned with the relations between organisms and their environment

Kernerman English Learner's Dictionary

1. ecology(noun)ɪˈkɒl ə dʒi

   the study of the environment and the relationships between things in it

   the ecology of the swamp; He's studying ecology.

Wiktionary

1. ecology(Noun)

   The branch of biology dealing with the relationships of organisms with their environment and with each other.

Origin: From Ökologie, from οἶκος + -λογία

U.S. National Library of Medicine

1. Ecology

   The branch of science concerned with the interrelationship of organisms and their ENVIRONMENT, especially as manifested by natural cycles and rhythms, community development and structure, interactions between different kinds of organisms, geographic distributions, and population alterations. (Webster's, 3d ed)

• ekologieAfrikaans
• عِلْم البيئَهArabic
• екологияBulgarian
• ecologiaPortuguese (BR)
• ekologieCzech
• dieÖkologieGerman
• økologiDanish
• οικολογίαGreek
• ecologíaSpanish
• ökoloogiaEstonian
• زیست بوم شناسی؛ رابطۀ موجودات با محیطFarsi
• ekologiaFinnish
• écologieFrench
• אֶקוֹלוֹגיָהHebrew
• परिस्थिति विज्ञान पौधों तथा प्राणियों का आपस में तथा परिवेश से सम्बन्धHindi
• ekologijaCroatian
• ökológiaHungarian
• ekologiIndonesian
• vistfræðiIcelandic
• ecologiaItalian
• 生態学Japanese
• 생태(학)Korean
• ekologijaLithuanian
• ekoloģijaLatvian
• ekologiMalay
• ecologieDutch
• økologiNorwegian
• ekologiaPolish
• زیست بوم شناسی؛ رابطۀ موجودات با محیطPersian
• د موجودات اریکی په چاپریالPashto
• ecologiaPortuguese
• ecologieRomanian
• экологияRussian
• životné prostredieSlovak
• ekologijaSlovenian
• ekologijaSerbian
• ekologiSwedish
• นิเวศวิทยา; ระบบนิเวศThai
• çevrebilimiTurkish
• 生態學Chinese (Trad.)
• екологіяUkrainian
• حیاتیات اور ان کے ماحول کے باہمی تعلق کا مطالعہUrdu
• 生态学Chinese (Simp.)