transitive verb
Definition 1
With respect to quantities, i.e. numbers, subtract, deduct.
Source: Invertext
Context: As division is repeated subtraction, you are in principle taking away three from eighteen six times.
Source: Mathematics for primary teachers, by Valsa Koshy, Paul Ernest, Ron Casey (Google Books)
Definition 2
Used absolutely with respect to qualities or innumerate entities, detract.
Source: Invertext
Context: It [an alternative vote system] takes away from the very principle that one man or woman has one vote.
Source: Financial Times 04/03/2011 (Elizabeth Rigby, quoting the Conservative party co-chairman, Lady Warsi)