Definition from Wiktionary, the free dictionary
See also: LGBT+
Attested since 1988. Used as a self-designation in United States gay rights activism since about 1990. 
- Sometimes, additional letters are added, such as 'Q' for 'queer' or 'questioning', 'I' for 'intersex', and 'P' for 'pansexual', 'A' for 'asexual', etc.
- Sometimes, the order of the letters is switched to GLBT.
- When speaking only of sexuality and not of gender, the abbreviation LGB or GLB may be used.
- Some authors avoid the umbrella term 'LGBT' because "gender identity is clearly distinct from sexual identity", the 'T' community "is itself heterogeneous, comprising intersex individuals, androgynes, transvestites, and a whole range of others", and transgender and genderqueer people "experience trans-phobia within LGB services and communities".
Lesbian, Gay, Bisexual, Transgender/Transexual
LGBT (plural LGBTs)
- (chiefly in the plural) A member of the LGBT community.
- ^ American Educational Research Association Verlag AERA (1988), “Research, policy and practice: Annual meeting”, in (Please provide the title of the work)
- ^ Katherine Cox, Sexual Orientation, in Death, Dying, and Social Differences (edited by David Oliviere, Barbara Monroe, Sheila Payne, published in 2011), page 197:
Although the umbrella term LGBT makes pragmatic sense, there are compelling arguments to treat transgendered people as distinct from LGB communities: gender identity is clearly distinct from sexual identity (Dean et al., 2000) and to conflate the two risks ignoring the particular experiences of this ["trans"] group which is itself heterogeneous, comprising intersex individuals, androgynes, transvestites, and a whole range of others. Transgendered people […] can experience trans-phobia within LGB services and communities[.]