1. posit- + -ive.
2. etymologically means 'placed down, laid down', hence 'emphatically asserted'.
3. from Latin, meaning 'settled by agreement'.
4. => dealing only with facts, absolute, expressed without qualification, confident in opinion, concentrating on what is constructive and good.
5. placed down, laid down: 着实、敲定、确定下来，或者主观、武断地确定下来，或者主观地认为确定下来了。
6. 即：由字面、词源含义(placed down, laid down)引申表示为：主观心理的、客观实际的放下来了、确定下来的、定下来了。
7. 主观心理的其实就是认为确定下来了、定下来了，由此引申为：确信的，自信的，有把握的；进一步引申为：怀有希望的，往好的方向走的；进一步引申为：积极的(而非消极的，就是一种乐观的、正面的认为确定下来了)；由此进一步引申为更宽泛的、广义的、各行业的“积极的”含义：阳性的，正数的，刚性的，向性的，趋性的等含义。
8. 该词的反义词为：negative.

positive 乐观的，积极的，实证的，阳性的，正极的

来自position,放置，位置，-ive,形容词后缀。即放好的，有位置的，原用于法律术语解决的，后引申诸多正面词义。

1. Remember, keep a positive attitude and good things will happen.

记住：保持乐观的心态，好事自然会发生。

2. You have to do everything you can. You have to work your hardest. And if you do, if you stay positive, then you have a shot at a silver lining.

你必须全力以赴，最大限度地去努力。如果你这么做，并且保持乐观，你就会看见乌云背后的幸福线。

3. I'm as positive as I can be about it.

我对它有绝对的把握。

4. A positive pregnancy test soon confirmed her intuitive feelings.

阳性孕检结果很快证实了她的直觉。

5. The athlete received a two-year suspension following a positive drug test.

该运动员因尿检结果呈阳性而被停赛两年。