re·flex·ive

[ri-flek-siv]
adjective
1.
Grammar.
a.
(of a verb) taking a subject and object with identical referents, as shave in I shave myself.
b.
(of a pronoun) used as an object to refer to the subject of a verb, as myself in I shave myself.
2.
reflex; responsive.
3.
able to reflect; reflective.
4.
Mathematics.
a.
noting a relation in which each element is in relation to itself, as the relation “less than or equal to.” Compare antireflexive.
b.
(of a vector space) having the property that the dual space of the dual space of the given vector space equals the given vector space.
noun
5.
Grammar. a reflexive verb or pronoun.
00:10
Reflexive is always a great word to know.
So is en dash. Does it mean:
a dash one en long.
a short oblique stroke (/) between two words indicating that whichever is appropriate may be chosen to complete the sense of the text in which they occur:

Origin:
1580–90; < Medieval Latin reflexīvus turned back, reflected. See reflex, -ive

re·flex·ive·ly, adverb
re·flex·ive·ness, re·flex·iv·i·ty [ree-flek-siv-i-tee] , noun
sem·i·re·flex·ive, adjective
sem·i·re·flex·ive·ly, adverb
sem·i·re·flex·ive·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
reflexive (rɪˈflɛksɪv) [Click for IPA pronunciation guide]
 
adj
1.  denoting a class of pronouns that refer back to the subject of a sentence or clause. Thus, in the sentence that man thinks a great deal of himself, the pronoun himself is reflexive
2.  denoting a verb used transitively with the reflexive pronoun as its direct object, as the French se lever "to get up" (literally "to raise oneself") or English to dress oneself
3.  physiol of or relating to a reflex
4.  logic, maths irreflexive Compare nonreflexive (of a relation) holding between any member of its domain and itself: "… is a member of the same family as …" is reflexive
 
n
5.  a reflexive pronoun or verb
 
re'flexively
 
adv
 
re'flexiveness
 
n
 
reflexivity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
reflexive   (rĭ-flěk'sĭv)  Pronunciation Key 
Of or relating to a mathematical or logical relation such that, for any given element, that element has the given relation to itself. Equality in mathematics is a reflexive relation, since a = a for all a, whereas the relation of being 'less than' is not, since it is not true that a < a for any a.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

reflexive definition

theory
A relation R is reflexive if, for all x, x R x.
Equivalence relations, pre-orders, partial orders and total orders are all reflexive.
(1999-01-28)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The reflexive response to congestion is to add more road capacity.
The inclusion of others feels reflexive and obligatory.
In other words it is reflexive and therefore indeterminate.
There is, however a new logic of relations which fail to be reflexive, symmetric and transitive.
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