facultative

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fac·ul·ta·tive

 (făk′əl-tā′tĭv)
adj.
1. Of or relating to a mental faculty.
2.
a. Capable of occurring or not occurring; contingent.
b. Not required or compulsory; optional.
3. Granting permission or authority.
4. Biology Capable of functioning under varying environmental conditions. Used of certain organisms, such as bacteria that can live with or without oxygen.

fac′ul·ta′tive·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

facultative

(ˈfækəltətɪv)
adj
1. (Law) empowering but not compelling the doing of an act
2. (Philosophy) philosophy that may or may not occur
3. (Insurance) insurance denoting a form of reinsurance in which the reinsurer has no obligation to accept a particular risk nor the insurer to reinsure, terms and conditions being negotiated for each reinsurance
4. (Biology) biology able to exist under more than one set of environmental conditions: a facultative parasite can exist as a parasite or a saprotroph. Compare obligate4
5. of or relating to a faculty
ˈfacultatively adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

fac•ul•ta•tive

(ˈfæk əlˌteɪ tɪv)

adj.
1. conferring a faculty, privilege, permission, or the power of doing or not doing something: a facultative enactment.
2. being left to one's option or choice; optional.
3. having the capacity to live under more than one specific set of environmental conditions, as a plant that can lead either a parasitic or a nonparasitic life (opposed to obligate).
4. of or pertaining to the mental faculties.
5. having the potential of taking place or assuming a specified character.
[1810–20; < French]
fac′ul•ta`tive•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.facultative - of or relating to the mental faculties
2.facultative - able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte"
biological science, biology - the science that studies living organisms
obligate - restricted to a particular condition of life; "an obligate anaerobe can survive only in the absence of oxygen"
3.facultative - granting a privilege or permission or power to do or not do something; "a facultative enactment"
enabling - providing legal power or sanction; "an enabling resolution"; "enabling power"
4.facultative - not compulsory; "facultative courses in the sciences"
optional - possible but not necessary; left to personal choice
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

facultative

adjective
Not compulsory or automatic:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations

fac·ul·ta·tive

a. facultativo-a.
1. voluntario, no obligatorio;
2. de naturaleza profesional.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
Paenibacillus are large, facultatively anaerobic, Gram-positive bacilli.
From the Greek kapnos ("smoke") for its dependence on carbon dioxide, which is a large component of smoke, Capnocytophaga canimorsus (Latin canis, "dog," and morsus, "bite") are gram-negative, facultatively anaerobic, rod-shaped bacteria that are part of the normal oral microbiota of dogs and cats.
Biosynthesis of Polyhydroxyalkanaotes by a Novel Facultatively Anaerobic Vibrio sp.
However, a phylogenetic analysis showed that the facultatively piscivorous and piscivorous Myotis species are not a monophyletic group (Ruedi & Mayer, 2001; Stadelmann, Herrera, Arroyo-Cabrales, Flores-Martinez, May, Ruedi, 2004).
Use of enzyme tests in characterization and identification of aerobic and facultatively anaerobic Gram-positive cocci.
We also reference troglophiles (or troglophilous organisms) --non-troglomorphic animals that occur facultatively within caves and complete their life cycles there, but also exist in similar cave-like habitats on the surface.
However, in other species, all or some of the axillary buds of vegetative leaves of the LIZ sprout facultatively (Fig.
Some researchers proposed that: facultatively heterofermentative LAB and enterobacteria were contributors for acetic fermentation and ammonia-N formation, e.g., Lactobacillusplantarum can deaminate serine to produce acetic acid and ammonia-N (LIU et al., 2003; PARVIN & NISHINO, 2009); Alfalfa and ryegrass silage with many Hafnia alvei was vigorous acetic fermentation and had high ammonia-N content (>100g/kg N) (MCDONALD et al., 1991).
The (http://rspb.royalsocietypublishing.org/content/285/1871/20171934) open-access study , titled "Strong social relationships are associated with decreased longevity in a facultatively social mammal," appeared online Wednesday in the journal Proceedings of the Royal Society B.
There is evidence for maternal manipulation of larval diet in facultatively eusocial bee species as well.

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