Full sun

Full sun (Exposure) [ Horticulture ]
Synonym: Sunny-brightly exposure

Dictionary of botanic terminology
index of names

An environment that receives at least 6 hours of direct, unobstructed sunlight.

"Full sun" generally means that plants should receive and tolerate at least six hours or more of direct sunlight per day given that the most intense sunlight occurs mostly in the afternoon (with a little in the late morning), shadows during these hours have a big effect on how much light plants receive. Six hours of direct sun during the morning is very different from the same six hours in the afternoon. Morning sun, even if it is six hours worth of direct sun is still not strong enough to be considered anything more than partial sun (or part shade) The afternoon sun has a stronger intensity which makes it more powerful.
See also: Sun exposure, Bright shade, Half shade, Full shade, Filtered sun

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994