1. (law) a person who acts on behalf of an infant or disabled person;
The Collaborative International Dictionary of English v.0.48:
Next \Next\ (n[e^]kst), a., superl. of Nigh. [AS. n[=e]hst,
ni['e]hst, n[=y]hst, superl. of ne['a]h nigh. See Nigh.]
1. Nearest in place; having no similar object intervening.
Her princely guest
Was next her side; in order sat the rest. --Dryden.
Fear followed me so hard, that I fled the next way.
2. Nearest in time; as, the next day or hour.
3. Adjoining in a series; immediately preceding or following
None could tell whose turn should be the next.
4. Nearest in degree, quality, rank, right, or relation; as,
the next heir was an infant.
The man is near of kin unto us, one of our next
kinsmen. --Ruth ii. 20.
Note: Next is usually followed by to before an object, but to
is sometimes omitted. In such cases next in considered
by many grammarians as a preposition.
Next friend (Law), one who represents an infant, a married
woman, or any person who can not appear sui juris, in a
suit at law.
WordNet (r) 3.0 (2006):
n 1: (law) a person who acts on behalf of an infant or disabled
Bouvier's Law Dictionary, Revised 6th Ed (1856):
NEXT FRIEND. One who, without being regularly appointed guardian, acts for
the benefit of an infant, married woman, or other person, not sui juris.
Vide Amy; Prochein Amy.