valid adj.
1 legally acceptable
VERBS be | become | remain, stay | deem sth, hold sth The original written contract was held valid.
ADV. still Is your passport still valid? | no longer | legally Is the contract legally valid?
PREP. for Vouchers are only valid for races taking place before 31 December.
2 strong and convincing
VERBS be, seem | become | remain | accept sth as, consider sth, deem sth, regard sth as We accepted several different approaches as valid.
ADV. extremely, very | absolutely, completely, perfectly This is a perfectly valid question to raise. | not entirely | reasonably | equally using a different, but equally valid, technique | universally a universally valid set of moral principles | not necessarily | not strictly That argument is not strictly valid in this case. | still | no longer The old assumptions are no longer valid. | logically, scientifically, statistically a logically valid deduction
You can also check other dicts: valid (English, 中文解释 ), wordnet sense, Collins Definition