Definition of approximately adverb from the Oxford Advanced Learner's Dictionary

    

approximately

 adverb
adverb
BrE BrE//əˈprɒksɪmətli//
 
; NAmE NAmE//əˈprɑːksɪmətli//
 
 
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used to show that something is almost, but not completely, accurate or correct The journey took approximately seven hours. The two buildings were approximately equal in size. Vocabulary BuildingWays of saying approximately The flight takes approximately three hours. The tickets cost about £20 each. The repairs will cost $200, give or take a few dollars. How much will it cost, more or less? We are expecting thirty or so people to come. She must be 25 or thereabouts. Profits have fallen by roughly 15%. You can expect to earn round about £40,000 a year. The price is somewhere around $800. She earns somewhere in the region of £25,000.All these words and phrases are used in both speaking and writing; about is the most common and approximately the most formal.
See the Oxford Advanced American Dictionary entry: approximately