Basic income is unconditionally granted.
Daniel Raventós and Julie Wark 07. “A Provocative but Possible Proposal.” Basic Income: The Material Conditions of Freedom, Pluto Press, 2007, pp. 7–24. JSTOR, https://doi.org/10.2307/j.ctt18fsbw8.5. AJ
Basic Income is an income paid by the state to each full member or accredited resident of a society, regardless of whether he or she wishes to engage in paid employment, or is rich or poor or, in other words, independently of any other sources of income that person might have, and irrespective of cohabitation arrangements in the domestic sphere.
Although it is somewhat long, this is the definition I prefer because it is clear (and also provocative). The Basic Income Earth Network definition is as follows:
A basic income is an income unconditionally granted to all on an individual basis, without means test or work requirement. It is a form of minimum income guarantee that differs from those that now exist in various European countries in three important ways: