measurable

mea‧su‧ra‧ble /ˈmeʒərəbəl/ BrE AmE adjective
[Word Family: adjective: ↑measurable ≠ ↑immeasurable, ↑measured, ↑measureless; noun: ↑measure, ↑measurement; verb: ↑measure; adverb: ↑measurably ≠ ↑immeasurably]
1. large or important enough to have an effect that can be seen or felt SYN noticeable:
The law has had little measurable effect since it was introduced two years ago.
2. able to be measured OPP immeasurable:
measurable results
—measurably adverb:
The company is working to make its environmental performance measurably better.

Oxford Advanced Learner's Dictionary

measurable

meas·ur·able [ˈmeʒərəbl] [ˈmeʒərəbl] adjective
1. that can be measured

• measurable amounts of pollution in the atmosphere

2. usually before noun large enough to be noticed or to have a clear and noticeable effect
• measurable improvements
Derived Word: measurably
Word Origin:

[measurable measurably] Middle English (in the sense ‘moderate’): from Old French mesurable, from late Latin mensurabilis, from Latin mensurare ‘to measure’.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

measurable / ˈmeʒ. ə r.ə.bl̩ / / -ɚ- / adjective

able to be measured, or large enough to be noticed:

The service produces clear, measurable benefits to people's health.

measurably / -bli / adverb

Collins Advanced Learner’s English Dictionary

measurable

[me̱ʒərəb(ə)l]
1) ADJ: usu ADJ n If you describe something as measurable, you mean that it is large enough to be noticed or to be significant. [FORMAL]
  Both leaders seemed to expect measurable progress.
  Derived words:
  measurably ADV-GRADED ADV adj/adv, ADV with v The old man's voice was measurably weaker than the last time they'd talked... After this, the pace of events quickened measurably.
2) ADJ-GRADED Something that is measurable can be measured.
  Economists emphasize measurable quantities - the number of jobs, the per capita income...
  So far the effect is barely measurable.

Merriam-Webster's Advanced Learner's Dictionary

measurable

mea·sur·able /ˈmɛʒərəbəl/ adj : large enough to be measured or noticed
• We haven't had a measurable amount of rain in the past several weeks.
• There has been a measurable [=significant] improvement in the company's performance.
- mea·sur·ably /ˈmɛʒərəbli/ adv
• His job performance has improved measurably.