#148. [Double or mutual change.] Interchange. —­ N. interchange,
exchange; commutation, permutation, intermutation; reciprocation, transposition, rearrangement; shuffling; alternation, reciprocity; castling [at chess]; hocus-pocus.
     interchangeableness[obs3], interchangeability.
     recombination; combination 48[ref], 84..
     barter &c. 794; tit for tat &c. (retaliation) 718; cross fire,
battledore and shuttlecock; quid pro quo. 
     V. interchange, exchange, counterchange[obs3]; bandy, transpose,
shuffle, change bands, swap, permute, reciprocate, commute; give and take, return the compliment; play at puss in the corner, play at battledore and shuttlecock; retaliate &c. 718; requite.
     rearrange, recombine. 
     Adj. interchanged &c. v.; reciprocal, mutual, commutative,
interchangeable, intercurrent[obs3].
     combinatorial[Math, Statistics].
     recombinant[Biology, Genetics]. 
     Adv. in exchange, vice versa, mutatis mutandis[Lat], backwards and
forwards, by turns, turn and turn about; each in his turn, everyone in his turn. 
     Adj. substituted &c. v.; vicarious, subdititious[obs3]. 
     Adv. instead; in place of, in lieu of, in the stead of, in the room
of; faute de mieux[Fr].

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     #149.  Changeableness. —­ N. changeableness &c. adj.; mutability,
inconstancy; versatility, mobility; instability, unstable equilibrium; vacillation &c. (irresolution) 605; fluctuation, vicissitude; alternation &c. (oscillation) 314. restlessness &c. adj. fidgets, disquiet; disquietude, inquietude; unrest; agitation &c. 315.
     moon, Proteus, chameleon, quicksilver, shifting sands, weathercock,
harlequin, Cynthia of the minute, April showers[obs3]; wheel of Fortune; transientness &c. 111[obs3]. 
     V. fluctuate, vary, waver, flounder, flicker, flitter, flit, flutter,
shift, shuffle, shake, totter, tremble, vacillate, wamble[obs3], turn and turn about, ring the changes; sway to and fro, shift to and fro; change and change about; waffle, blow with the wind (irresolute) 605; oscillate &c. 314; vibrate between, two extremes, oscillate between, two extremes; alternate; have as man phases as the moon. 
     Adj. changeable, changeful; changing &c. 140; mutable, variable,
checkered, ever changing; protean, proteiform|; versatile.
     unstaid[obs3], inconstant; unsteady, unstable, unfixed, unsettled;
fluctuating &c. v.; restless; agitated &c. 315; erratic, fickle; irresolute &c. 605; capricious &c. 608; touch and go; inconsonant, fitful, spasmodic; vibratory; vagrant, wayward; desultory; afloat; alternating; alterable, plastic, mobile; transient &c. 111; wavering. 
     Adv. seesaw &c. (oscillation) 314; off and on. 
Phr. “a rolling stone gathers no moss”; pictra mossa non fa muschis[It]; honores mutant mores[Lat]; varium et mutabile semper femina [Lat][Vergil].