a rough calculation or guess (based on incomplete information) of a value, quantity, or extent of something
"He and I should differ very little in our estimation of the two," interrupted she, with a sort of serious smile—"much less, perhaps, than he is aware of, if we could enter without ceremony or reserve on the subject."
—She looked back; she compared the two—compared them, as they had always stood in her estimation, from the time of the latter's becoming known to her— and as they must at any time have been compared by her, had it—oh! had it, by any blessed felicity, occurred to her, to institute the comparison.
…in her eyes, seemed all that he cared for—and Emma, glad to be enlivened, not sorry to be flattered, was gay and easy too, and gave him all the friendly encouragement, the admission to be gallant, which she had ever given in the first and most animating period of their acquaintance; but which now, in her own estimation, meant nothing, though in the judgment of most people looking on it must have had such an appearance as no English word but flirtation could very well describe.
There are no more uses of "estimate" identified with this meaning, but check unspecified meaning below.
Show samples from other sources
What is the estimate to repair the car?
I hope her estimate of less than $100 is good because I only have $100.
If you were as much guided by nature in your estimate of men and women, and as little under the power of fancy and whim in your dealings with them, as you are where these children are concerned, we might always think alike.
She had not deserved it; she had often been negligent or perverse, slighting his advice, or even wilfully opposing him, insensible of half his merits, and quarrelling with him because he would not acknowledge her false and insolent estimate of her own—but still, from family attachment and habit, and thorough excellence of mind, he had loved her, and watched over her from a girl, with an endeavour to improve her, and an anxiety for her doing right, which no other creature had at all…