FRACTIONALLY

Etymology

Adverb

fractionally (comparative more fractionally, superlative most fractionally)

In a fractional manner

One twin was fractionally older than the other.

Source: Wiktionary

Frac"tion*al*ly, adv.

Definition: By fractions or separate portions; as, to distill a liquid fractionally, that is, so as to separate different portions.

FRACTIONAL

Frac"tion*al, a.

1. Of or pertaining to fractions or a fraction; constituting a fraction; as, fractional numbers.

2. Relatively small; inconsiderable; insignificant; as, a fractional part of the population. Fractional crystallization (Chem.), a process of gradual and approximate purification and separation, by means of repeated solution and crystallization therefrom.

– Fractional currency, small coin, or paper notes, in circulation, of less value than the monetary unit.

– Fractional distillation (Chem.), a process of distillation so conducted that a mixture of liquids, differing considerably from each other in their boiling points, can be separated into its constituents.

Source: Webster’s Unabridged Dictionary 1913 Edition