Similar words: aback, acute, acumen, vacuum, lacuna, faculty, evacuate, mea culpa. Meaning: ['æbəkəs] 
n. 1. a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave 2. a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves.
n. 1. a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave 2. a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves. 
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31 The monoline insurer found itself both and acting as the portfolio selection agent for Abacus 2007 - AC 1 .
32 The abacus is just a visual record of the computations going on in the mind of the person using it.
33 Sneer at a way: The abacus disguised as such, not cheating, quick off!
34 At the other end of Eurasia, Lao-tzu, Chuang-tzu and the followers of Confucius elaborated Chinese thought; the abacus and blast furnace were invented; and the Grand Canal was begun.
35 The high speed of Abacus Arithmetic and the Mental Arithmetic in the Way of Abacus gives children a good chance to be quick in the uptake.
36 As agile amplification abides to outdistance appeal, carriers are abacus to bottleneck botherations at some Chinese airports.
37 I spend a bit of the stomach throws ring for a small abacus Bola : themselves?
38 But that position did not arise because of Abacus 2007 - AC 1 .
39 Except for the sharp clicking of Chueh - hsin's abacus counters, all was still.
40 With the application of the abacus, people summarized many abacus rhymes, increasing the calculating speed.
41 In response to declining math skills among their students, some Japanese schools are bringing back an ancient calculating device - the abacus.
42 The clerk reckoned the expenditure last week with an abacus.
43 The room was very quiet. Even the sound of the abacus was stilled.
44 An abacus is also a counting machine,[http://sentencedict.com/abacus.html] using our brain and our fingers.